(3fGSN GdbQBf hefShNg (B:s (3fhGSN GdbQBf (B/s - (3GHf GdLhRj, YHO GdQMef Hf Ydj Hf eMeO,s 508-597 (3g`(B.s; (3GdOGQGfj, MSjf Sdje CSOs ((3OeTb ;s (3HjQhJ (B:s (3OGQ GdKbGaI GdYQHjI,s, 1990)
Keywords: (3GdbQBfs -- (3GdfGSN hGdefShNs