@article{CRMATH_2018__356_4_412_0,
     author = {Akopyan, Arseniy},
     title = {On the number of non-hexagons in a planar tiling},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {412--414},
     publisher = {Elsevier},
     volume = {356},
     number = {4},
     year = {2018},
     doi = {10.1016/j.crma.2018.03.005},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2018.03.005/}
}