Classical calculation of proton collisions with ethylene H. Getahun, L. F. Errea, C. Illescas, L. Méndez and I. Rabadán Eur. Phys. J. D, 60 1 (2010) 45-49 Published online: 26 January 2010 DOI: 10.1140/epjd/e2010-00011-2