(3cja JMGaXjf Ydi QTGbJc hLeGdc (B/s - (3QaYJ , eMeOs (3eYO ,s; (3QaYJ, eMeOs ((3HjQhJ (B:s (3OGQ GdeYQaI,s, 1981)
Keywords: (3GdQLjes; (3GdeQCIs -- (3UMI hfXGaIs; (3GdQjGVI GdHOfjIs