Gmachl, M., Gieffers, C., Podtelejnikov, A. V., Mann, M., & Peters, J. (2000). The RING-H2 Finger Protein APC11 and the E2 Enzyme UBC4 Are Sufficient to Ubiquitinate Substrates of the Anaphase-Promoting Complex. Proceedings of the National Academy of Sciences of the United States of America, 97(16), 8973-8978.

Gmachl, Michael, Christian Gieffers, Alexandre V. Podtelejnikov, Matthias Mann, and Jan-Michael Peters. "The RING-H2 Finger Protein APC11 and the E2 Enzyme UBC4 Are Sufficient to Ubiquitinate Substrates of the Anaphase-Promoting Complex." Proceedings of the National Academy of Sciences of the United States of America 97, no. 16 (2000): 8973-8978.

Gmachl, Michael, et al. "The RING-H2 Finger Protein APC11 and the E2 Enzyme UBC4 Are Sufficient to Ubiquitinate Substrates of the Anaphase-Promoting Complex." Proceedings of the National Academy of Sciences of the United States of America, vol. 97, no. 16, 2000, pp. 8973-8978.