The VR research boom of the 1990s was accompanied by the non-fiction book Virtual Reality ( 1991 ) by Howard Rheingold.

Jeffrey Shaw explored the potential of VR in fine arts with early works like Legible City ( 1989 ), Virtual Museum ( 1991 ), and Golden Calf ( 1994 ).

Rosenberg developed one of the first known AR systems, called Virtual Fixtures, while working at the U. S. Air Force Armstrong Labs in 1991, and published first study of how an AR system can enhance human performance.

This was replaced by the " Virtual Globe " on 16 February 1991.

* Robb, Fenton F. ( 1991 ) Accounting – A Virtual Autopoietic System?

Nintendo announced on August 17, 2011, that Metroid II, along with other Game Boy games such as Super Mario Land 2: 6 Golden Coins ( 1992 ), Mega Man: Dr. Wily's Revenge ( 1991 ), and several others would be released on the Nintendo 3DS's Virtual Console platform at the end of the year.

In 1991, he published Virtual Reality: Exploring the Brave New Technologies of Artificial Experience and Interactive Worlds from Cyberspace to Teledildonics.

* Virtual Reality ( 1991 )

TwinBee ( also known as Bells & Whistles outside Japan ), first released on February 21, 1991: An arcade release, also ported to PC Engine ( which was ported to Virtual Console ), Sharp X68000, PlayStation and Sega Saturn ( the latter two bundled with TwinBee Yahho!

Although Hewson Consultants closed in 1991, their games are still covered in the retro gaming press, and many of their hit titles including Uridium, Paradroid, Nebulus and Cybernoid, have recently launched on Nintendo's Virtual Console game download service.

The game was originally released in 1991 and later re-released on the Nintendo Wii's Virtual Console in 2006.

" In Virtual Reality: Theory, Practice and Promise, S. Helsel and J. Roth, ed., Meckler Publishing, 1991.

* Last Ninja 3: Commodore 64 ( 1991 ), Amiga ( 1991 ), Atari ST ( 1991 ), Amiga CD32 ( 1993 ), Virtual Console ( 2008 )

* 1991 Fables and Other Realities

The Angolan Armed Forces ( Portuguese: Forças Armadas Angolanas ) are the military in Angola that succeeded Forças Armadas de Libertação de Angola ( FAPLA ) following the abortive Bicesse Accord with UNITA in 1991.

In 1990-91, the Army had ten military regions and an estimated 73 + ' brigades ', each with a mean strength of 1, 000 and comprising infantry, tanks, APC, artillery, and AA units as required ( IISS Military Balance 1990 or 1991 ).

* 1991 – A cyclone strikes the Chittagong district of southeastern Bangladesh with winds of around, killing at least 138, 000 people and leaving as many as 10 million homeless.

* The origins of ` Pursuing Stacks ' This is an account of how ` Pursuing Stacks ' was written in response to a correspondence in English with Ronnie Brown and Tim Porter at Bangor, which continued until 1991.

He co-authored the 1991 book The Japan That Can Say No with politician Shintaro Ishihara, where they criticized American business practices and encouraged Japanese to take a more independent role in business and foreign affairs.

* 1991 – Italian ferry Moby Prince collides with an oil tanker in dense fog off Livorno, Italy killing 140.

In 1991, Atari Corp. relaunched the Lynx with a new marketing campaign, new packaging, slightly improved hardware, and a new sleek look.

A first US IPO followed in 1989 after Ben Rosen joined the Borland board with Goldman Sachs as the lead banker and a second offering in 1991 with Lazard as the lead banker.

In Australia and New Zealand the largest barter exchange is Bartercard, founded in 1991, with offices in the UK, Thailand and Cyprus.

In 1991, the Orioles experimented with longtime TV writer / producer Ken Levine as a play-by-play broadcaster.

* Microsoft Windows contains application compatibility shims to make the platform compatible with most software from earlier 32-bit and 16-bit versions ( e. g. Civilization ( circa 1991, designed for Windows 3. 0 ) running on Windows Vista ).

Songwriters Tom Russell and Dave Alvin addressed Haley's demise in musical terms with " Haley's Comet " on Alvin's 1991 album Blue Blvd.

Some believe that Georg Cantor's set theory was not actually implicated by these paradoxes ( see Frápolli 1991 ); one difficulty in determining this with certainty is that Cantor did not provide an axiomatization of his system.

In early 1991, Bixby was diagnosed with prostate cancer and underwent treatment.

He appeared as an opening act for The Clash in their 1979 US tour ; in Legends of Guitar ( filmed live in Spain, 1991 ) with B. B.

2nd Edition ( 1991 ) with additional third author Frangois Ochsenbein, 2 volumes, LCCN 91026764.

After 3 months of provisional government, Déby ’ s Patriotic Salvation Movement ( MPS ) approved a national charter on February 28, 1991, with Déby as president.

With French support, a reorganization of the armed forces was initiated early in 1991 with the goal of reducing its numbers and making its ethnic composition reflective of the country as a whole.

On October 23, 1991, the Paris Conference reconvened to sign a comprehensive settlement giving the UN full authority to supervise a cease-fire, repatriate the displaced Khmer along the border with Thailand, disarm and demobilize the factional armies, and prepare the country for free and fair elections.

The population rose steadily ( with the exception of censuses taken following the two world wars ) from 2. 1 million in 1857 until 1991, when it peaked at 4. 7 million.

When the Soviet Union broke up in late 1991, a major boost to Cuba's economy was lost, leaving it essentially paralyzed because of the economy's narrow basis, focused on just a few products with just a few buyers.

In 1991, Cyprus introduced a Value Added Tax ( VAT ), which is currently 15 % in line with the EU minimum.

Love also briefly dated Billy Corgan in early 1991, but her most prolific relationship was undoubtedly with Nirvana frontman Kurt Cobain.

Colombia's present constitution, enacted on July 5, 1991, strengthened the administration of justice with the provision for introduction of an adversarial system which ultimately is to entirely replace the existing Napoleonic Code.

Among his predecessors as editors-in-chief were Hugh Chisholm ( 1902 – 1924 ), James Louis Garvin ( 1926 – 1932 ), Franklin Henry Hooper ( 1932 – 1938 ), Walter Yust ( 1938 – 1960 ), Harry Ashmore ( 1960 – 1963 ), Warren E. Preece ( 1964 – 1968, 1969 – 1975 ), Sir William Haley ( 1968 – 1969 ), Philip W. Goetz ( 1979 – 1991 ), and Robert McHenry ( 1992 – 1997 ).

In 1991, he played Warren Morris in the short-lived ABC live-action sitcom Sibs.

* Billy Lewis ( Warren Frost ) – Ben's childhood friend and Cliff's father ( 1991 – 1995 )

Between 1987 and 1991 there were Kenneth Patchen Festivals, celebrating his work, in Warren, Ohio, which encompasses the town of Niles where Patchen was born and grew up.

* Warren Congregational Church-built in 1818 and added to the National Register of Historic Places in 1991.

Warren also mentions Leon Rubin's 1984 Ontario production ( where the controversial line was altered to " All my love to Silvia I also give to thee "), David Thacker's 1991 Swan Theatre production, and the 1983 BBC Shakespeare television adaptation as supporting the theory that Valentine is not giving Silvia away, but is simply promising to love Proteus as much as he loves Silvia.

Levinson also directed Good Morning, Vietnam ( 1987 ) and Toys ( 1992 ), both with Robin Williams, and the critically acclaimed Bugsy ( 1991 ) with Warren Beatty.

Nan P. " Nanny " Britton ( November 9, 1896 – March 21, 1991 ) was a figure associated with the Presidency of Warren G. Harding due to her claim that Harding fathered her illegitimate daughter shortly before his election as President.

* French, Warren G. " The San Francisco Poetry Renaissance 1955-1960 " ( Twayne, 1991 ).

* View to Learn by Philip Hope and Warren Feek, 1991, ITV and Channel Four Community Education

During his studies at Vanderbilt, he met literary critics and future collaborators Robert Penn Warren, John Crowe Ransom, Andrew Lytle, and Donald Davidson ( Singh 1991 ).

Studying with Ransom and Warren, Brooks became involved in two significant literary movements: the Southern Agrarians and the Fugitives ( Singh 1991 ).

The Fugitives, a group of Southern poets consisting of such influential writers as John Crowe Ransom, Allen Tate, Donald Davidson, and Robert Penn Warren, met Saturday evenings to read and discuss poetry written by members of the group ( Singh 1991 ).

Brooks and Warren were teaching using textbooks " full of biographical facts and impressionistic criticism " ( Singh 1991 ).

For Brooks and Warren, paraphrase and biographical and historical background information is useful as a means of clarifying interpretation, but it should be used as means to an end ( Singh 1991 ).

Further, critics praise Brooks and Warren for “ introducing New Criticism with commendable clarity ” ( Singh 1991 ) and for teaching students how to read and interpret poetry.

He has appeared in many films such as the deformed mobster Flattop in Dick Tracy starring Warren Beatty, and as crime racket leaders such as Richie Madano in the 1991 Steven Seagal film, Out for Justice.

* Nan Britton ( 1896 – 1991 ), who claimed to have been the mistress of President Warren G. Harding

Although several personalities in the popular media in Australia, Britain, and the United States have negatively portrayed the usage of HRT, claiming that its use is exhibiting a speaker's insecurities about the statement, more recent evidence ( McLemore, 1991 ; Cheng et al., 2005 ; Warren, 2005 ) shows that leaders of the peer group are more likely to use HRT in their declaratives than the junior members of the particular peer group.

* Robert Warren – bass guitar, backing vocals ( 1991 – 2002 )

In 1991, after the release of their second album, So Much 2 Say, Mervyn Warren left the group to pursue a career as a producer.

* Mervyn Warren ( 1980 – 1991 ) second tenor

* Vampirella ( various titles, 1991 – 2008 )— acquired from Warren Publishing

He played Warren Lockridge on Santa Barbara ( 1991 – 93 ).

* Manual of the Flowering Plants of Hawai ‘ i, Warren L. Wagner and Derral R. Herbst ( 1991 ) + suppl.