Gijs Schaftenaar, Elias Vlieg and Gerrit Vriend,"Molden 2.0: quantum chemistry meets proteins", J Comput Aided Mol Des (2017) 31: 789 G.Schaftenaar and J.H. Noordik, "Molden: a pre- and post-processing program for molecular and electronic structures", J. Comput.-Aided Mol. Design, 14 (2000) 123-134