@article{EXMA_2006__15_4_232102,
     author = {Gravner, Janko and Griffeath, David},
     title = {Modeling snow crystal growth. {I:} {Rigorous} results for {Packard's} digital snowflakes.},
     journal = {Experimental mathematics},
     pages = {421--444},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2006},
     zbl = {1122.37057},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_2006__15_4_232102/}
}