@article{10_4171_ifb_82,
     author = {Giovanni Bellettini and Giuseppe Riey and Matteo Novaga},
     title = {First variation of anisotropic energies and crystalline mean curvature of partitions},
     journal = {Interfaces and free boundaries},
     pages = {331--356},
     year = {2003},
     volume = {5},
     number = {3},
     doi = {10.4171/ifb/82},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/82/}
}