@article{DM_1996_8_2_a4,
     author = {E. E. Marenich},
     title = {The singularity of some relations and their combinatorial applications},
     journal = {Diskretnaya Matematika},
     pages = {63--88},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1996_8_2_a4/}
}