@Article{ mannovtor03, author = { Mantegazza, Carlo and Novaga, Matteo and Tortorelli, Vincenzo Maria }, title = { Motion by Curvature of Planar Networks }, journal = { Ann. Sc. Norm. Super. Pisa Cl. Sci. }, year = { 2004 }, volume = { 3 }, number = { 2 }, pages = { 235-324 }, URL = { http://cvgmt.sns.it/paper/473/ }, note = { cvgmt preprint} }