Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1982_12_a12, author = {V. L. Kreptogorskii}, title = {Two-dimensional $K$-families}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {67--70}, publisher = {mathdoc}, number = {12}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1982_12_a12/} }
V. L. Kreptogorskii. Two-dimensional $K$-families. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1982), pp. 67-70. http://geodesic.mathdoc.fr/item/IVM_1982_12_a12/