Ana M. Rodrı́guez, Héctor A. Baldoni, Fernando Suvire, Rodolfo Nieto Vázquez, Graciela Zamarbide, Ricardo D. Enriz, Ödön Farkas, András Perczel, Michael A. McAllister, Leslie L. Torday, Julius G. Papp, Imre G. Csizmadia,
Characteristics of Ramachandran maps of L-alanine diamides as computed by various molecular mechanics, semiempirical and ab initio MO methods.: A search for primary standard of peptide conformational stability Journal of Molecular Structure-theochem. ,vol. 455, pp. 275- 301 ,(1998) ,
10.1016/S0166-1280(98)00221-8