Page "Homological algebra" Paragraph 17

* Gelfand, Sergei I .; Yuri Manin, Homological algebra.

Translated from the 1989 Russian original by the authors.

Reprint of the original English edition from the series Encyclopaedia of Mathematical Sciences ( Algebra, V, Encyclopaedia Math.

Sci., 38, Springer, Berlin, 1994 ).

Springer-Verlag, Berlin, 1999. iv + 222 pp. ISBN 3-540-65378-3