Badertscher, M.; Bischofberger, K.; Munk, M.E.; Pretsch, E. (). „A Novel Formalism To Characterize the Degree of Unsaturation of Organic Molecules”. Journal of Chemical Information and Modeling. 41 (4): 889–93. doi:10.1021/ci000135o. PMID11500105.
Badertscher, M.; Bischofberger, K.; Munk, M.E.; Pretsch, E. (). „A Novel Formalism To Characterize the Degree of Unsaturation of Organic Molecules”. Journal of Chemical Information and Modeling. 41 (4): 889–93. doi:10.1021/ci000135o. PMID11500105.