(3GdYbjOI h GdGNdGb (B:s (3h CKQgG aj MjGI GdaQO h GdeLJeY (B/s - (3eMeO, HjUGQs ((3HjQhJ (B:s (3OGQ GdcJGH GddHfGfj ,s, 1973)
Keywords: (3GdGNdGb s; (3GdaQO s; (3GdeLJeYs; (3GdYbjOI s