Rey, M., Roberts, SM., Dreiding, AS., Roussel, A., Vanlierde, H., Toppet, S., & Ghosez, L. (1982). Unexpected Configurational and Conformational Preference in Bicyclo[3.2.0]heptane Systems. Helvetica Chimica Acta, 65(3), 703-720. https://doi.org/10.1002/hlca.19820650308 (Original work published 1982)