%0 Journal Article
%T Plane curves which generalize classic quadrics
%A Ryzhkova, E..
%A Sitnik, S..
%K curves, quadrics, ellipsis, hyperbolas, parabolas, focus, .directrix.  
%J Actual directions of scientific researches of the XXI century: theory and practice
%D 2015
%N 3
%P 4
%I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov