@article{DA_1998_5_4_a1,
     author = {O. V. Borodin and D. V. Loparev},
     title = {The height of small faces in planar normal maps},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {6--17},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1998_5_4_a1/}
}