Couzijn, Erik P. A.; Slootweg, J. Chris; Ehlers, Andreas W.; Lammertsma, Koop (2010). "Stereomutation of Pentavalent Compounds: Validating the Berry Pseudorotation, Redressing Ugi's Turnstile Rotation, and Revealing the Two- and Three-Arm Turnstiles". Journal of the American Chemical Society. 132 (51): 18127–18140. doi:10.1021/ja105306s. PMID21082808.
nih.gov
pubmed.ncbi.nlm.nih.gov
Couzijn, Erik P. A.; Slootweg, J. Chris; Ehlers, Andreas W.; Lammertsma, Koop (2010). "Stereomutation of Pentavalent Compounds: Validating the Berry Pseudorotation, Redressing Ugi's Turnstile Rotation, and Revealing the Two- and Three-Arm Turnstiles". Journal of the American Chemical Society. 132 (51): 18127–18140. doi:10.1021/ja105306s. PMID21082808.