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Schwarz, Sylvia E., Kai Matuschewski, Dimitris Liakopoulos, Martin Scheffner, och Stefan Jentsch. The Ubiquitin-like Proteins SMT3 and SUMO-1 Are Conjugated By the UBC9 E2 enzyme. The National Academy of Sciences, 1998.

Schwarz, Sylvia E., et al. The Ubiquitin-like Proteins SMT3 and SUMO-1 Are Conjugated By the UBC9 E2 enzyme. The National Academy of Sciences, 1998.