@article{EXMA_1998__7_3_222628,
     author = {Buckingham, David J. and Callahan, Paul B.},
     title = {Tight bounds on periodic cell configurations in life.},
     journal = {Experimental mathematics},
     pages = {221--241},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {1998},
     zbl = {1002.92501},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_1998__7_3_222628/}
}