%0 Journal Article %A E. G. Emel'yanov %T The tangent properties of trajectories of certain two quadratic differentials %J Zapiski Nauchnykh Seminarov POMI %D 2013 %P 90-104 %V 418 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2013_418_a5/ %G ru %F ZNSL_2013_418_a5