%0 Journal Article %A S. L. Pevzner %T Properties of second-order curves in the Lobatchevsky plane which are dual under the focal directrix %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1961 %P 39-50 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1961_5_a5/ %G ru %F IVM_1961_5_a5