OMEGA code: calculation of the geometrical parameters of detection systems - Likhachev, Vladimir Petrovich; Arruda Neto, João Dias de Toledo; Martins, Marcos Nogueira; Garcia, F; Mesa, J; Rodriguez, O; Shostak, V B; Evseev, I; Paschuk, S A; Schelin, H R; Denyak, V V (Computer Physics Communications, 2001)