Shape optimization in lipid nanotube networks T. Lobovkina, P. G. Dommersnes, S. Tiourine, J. -F. Joanny and O. Orwar Eur. Phys. J. E, 26 3 (2008) 295-300 Published online: 26 May 2008 DOI: 10.1140/epje/i2007-10325-x