TY JOUR TI APPROXIMATION OF THE WORKSPACE OF PARALLEL AND SERIAL STRUC-TURE MANIPULATORS AS PART OF THE MULTI-ROBOT SYSTEM KW serial structure robot KW parallel structure robot KW approximation algorithm JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Rybak, L.A. AU Behera, L.. AU Malyshev, D.. AU Virabyan, L.G. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov