@article{AUPO_2001_40_1_a8,
     author = {Gravier, Sylvain and Payan, Charles},
     title = {Tilings and isoperimetrical shapes {I:} {Square} lattice},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {63--77},
     year = {2001},
     volume = {40},
     number = {1},
     mrnumber = {1904686},
     zbl = {1042.52019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2001_40_1_a8/}
}