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„RNase A”. biooscientific.com. Архивирано из оригинала 19. 05. 2014. г. Приступљено 2015-11-07.
worldcat.org
Noguchi, Shuji (2010). „Isomerization mechanism of aspartate to isoaspartate implied by structures ofUstilago sphaerogenaribonuclease U2 complexed with adenosine 3′-monophosphate”. Acta Crystallographica Section D. 66 (7): 843—849. ISSN0907-4449. doi:10.1107/S0907444910019621.