Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1998_3_a8, author = {M. A. Cheshkova}, title = {On a~property of orthogonal surfaces}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {63--64}, publisher = {mathdoc}, number = {3}, year = {1998}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1998_3_a8/} }
M. A. Cheshkova. On a~property of orthogonal surfaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1998), pp. 63-64. http://geodesic.mathdoc.fr/item/IVM_1998_3_a8/