TY JOUR TI Definition of surface order quasi-rotation by graphic method KW rotation KW quasi-rotation KW shaping KW curve axis KW circle KW ellipse KW Dupin cyclide KW cyclic surface KW rotation axis KW high order surface KW high order curve JO Journal of Technical Research AU Dvoreckov, P.A. AU Getmanskaya, V.K. PY 2020 IS 6 PB INFRA-M Academic Publishing LLC.