TY JOUR TI Beam tracing analytical algorithms optimization in simulation of urban radio waves propagation KW path KW raytracing KW non-linear system tquations. JO Actual directions of scientific researches of the XXI century: theory and practice AU Asotov, D.. AU Sereda, V.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov