Szolomajer, Janos; Paragi, Gabor; Batta, Gyula; Guerra, Celia Fonseca; Bickelhaupt, F. Matthias; Kele, Zoltan; Padar, Petra; Kupihar, Zoltan; Kovacs, Lajos New Journal of Chemistry, 2011 , vol. 35, # 2 p. 476 - 482