Solitary waves of α-helix propagation in media with arbitrary inhomogeneities Alain Mvogo, Germain Hubert Ben-Bolie and Timoléon Crépin Kofané Eur. Phys. J. B, 86 5 (2013) 217 Published online: 16 May 2013 DOI: 10.1140/epjb/e2013-31120-7