Heinz Oberhammer Molecular structures and conformations: Experiment and theory. 123-128 1998 19 Journal of Computational Chemistry 2 http://dx.doi.org/10.1002/(SICI)1096-987X(19980130)19:2<123::AID-JCC4>3.0.CO;2-W db/journals/jcc/jcc19.html#Oberhammer98