A simple atomistic model for the simulation of the gel phase of lipid bilayers G. La Penna, S. Letardi, V. Minicozzi, S. Morante, G.C. Rossi and G. Salina Eur. Phys. J. E, 5 3 (2001) 259-274 Published online: 15 June 2001 DOI: 10.1007/s101890170058