@article{VMUMM_2001_1_a12,
     author = {I. Yu. Zhdanovskii},
     title = {Orthogonal {pairs.~I}},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {51--54},
     publisher = {mathdoc},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2001_1_a12/}
}