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According to the Journal Citation Reports, the journal has a 2009 impact factor of 4. 174, ranking it first among 255 journals in the category " Mathematics ".

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 4. 736, ranking it 21th out of 131 journals in the category " Ecology " and 10th out of 45 journals in the category " Evolutionary Biology ".

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According to the Journal Citation Reports, the journal's 2011 impact factor is 9. 681.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 2. 123, ranking it 15th out of 62 journals in the category " Health Policy & Services ", 27th out of 76 journals in the category " Health Care Sciences & Services ", and 36th out of 320 journals in the category " Economics ",

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 11. 452, ranking it first in the category ' Biology '.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 30. 026, ranking it third out of 153 journals in the category " Medicine, General & Internal ".

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 1. 971.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 5. 415.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 841.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 4. 900, ranking it 9th out of 56 journals in the category " Astronomy & Astrophysics ".

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 274, ranking it 29th out of 37 journals in the category " Social Issues ".

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According to the Journal Citation Reports, the journal had a 2008 impact factor of 0. 804.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 720.

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According to the Journal Citation Reports, the journal has a 2009 impact factor of 1. 758, ranking it 10th among 255 mathematics journals.

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According to the Journal Citation Reports, the journal's 2011 impact factor is 8. 026.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 13. 608.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 779, ranking it 8th out of 50 journals in the category " History and Philosophy of Science " ( Science edition ) and 7th out of 36 journals in the same category in the Social Sciences edition.

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According to the Journal Citation Reports, the journal has a 2010 impact factor of 2. 056.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 5. 920, ranking it second out of 320 journals in the category " Economics ".

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 2. 517.

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According to the Journal Citation Reports, the journal has a 2010 impact factor of 1. 691, ranking it 37th out of 108 journals in the category " Computer Science, Artificial Intelligence ".

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According to the Journal Citation Reports, the journal has a 2009 impact factor of 3. 613, ranking it second out of 41 journals in the category " Paleontology ".

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According to the Journal Citation Reports, the journal has a 2010 impact factor of 1. 170.

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According to the Journal Citation Reports, the journal has a 2011 impact factor of 0. 471, ranking it 90th among 124 journals in the category " Psychology, Multidisciplinary " and 55th among 89 journals in the category " Social Sciences, Interdisciplinary ".

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