@article{DE_1993_29_7_a13,
     author = {V. L. Makarov and S. V. Makarov and M. N. Moskal'kov},
     title = {Spectral properties of the {Laplace} difference operator on a hexagonal grid, and some of their applications},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1216--1221},
     publisher = {mathdoc},
     volume = {29},
     number = {7},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_7_a13/}
}