%0 Journal Article %A P. E. Krasnushkin %T Qualitative investigation of radiowax-ray trajectories in a laminar medium by the method of phase trajectories %J Doklady Akademii Nauk %D 1971 %P 1313-1316 %V 200 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1971_200_6_a14/ %G ru %F DAN_1971_200_6_a14