@article{CHEB_2015_16_2_a16,
     author = {M. I. Shtogrin},
     title = {On rational directions in the flat lattice},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {273--281},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2015_16_2_a16/}
}