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@article{MS_1957__84_1_a2, author = {{\CYRN}.{\CYRI}. {\CYRK}{\cyro}{\cyrv}{\cyra}{\cyrn}{\cyrc}{\cyro}{\cyrv}}, title = {{\CYRO}{\cyrd}{\cyrn}{\cyro}{\cyrp}{\cyra}{\cyrr}{\cyra}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyre} {\cyrs}{\cyre}{\cyrm}{\cyre}{\cyrishrt}{\cyrs}{\cyrt}{\cyrv}{\cyra} {\cyrk}{\cyro}{\cyrn}{\cyrg}{\cyrr}{\cyru}{\cyrerev}{\cyrn}{\cyrc}{\cyri}{\cyrishrt} {\cyrs} {\cyrl}{\cyri}{\cyrn}{\cyre}{\cyrishrt}{\cyrch}{\cyra}{\cyrt}{\cyrery}{\cyrm}{\cyri} {\cyrf}{\cyro}{\cyrk}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrm}{\cyri} {\cyrp}{\cyro}{\cyrv}{\cyre}{\cyrr}{\cyrh}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyrya}{\cyrm}{\cyri}}, journal = {Matemati\v{c}eskij sbornik}, pages = {45--64}, publisher = {mathdoc}, volume = {84}, number = {1}, year = {1957}, zbl = {0079.15402}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1957__84_1_a2/} }
Н.И. Кованцов. Однопараметрические семейства конгруэнций с линейчатыми фокальными поверхностями. Matematičeskij sbornik, Tome 84 (1957) no. 1, pp. 45-64. http://geodesic.mathdoc.fr/item/MS_1957__84_1_a2/