TY JOUR TI Kinematics of interacting solitons in two-dimensional space KW Surface and internal waves KW solitons KW kinematic approach KW Kadomtsev-Petviashvili equation KW Benjamin-Ono equation KW two-soliton solutions JO Russian Journal of Earth Sciences AU Ostrovsky, L.A. AU Stepanyants, Y.A. PY 2020 IS 20 PB Geophysical Center of the Russian Academy of Sciences