@article{AUPO_2001__40_1_a9,
     author = {Gravier, Sylvain},
     title = {Tilings and isoperimetrical shapes. {II.} {Hexagonal} lattice},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {79--92},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {2001},
     mrnumber = {1904687},
     zbl = {1042.52018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2001__40_1_a9/}
}