(3GdGhbGa hGdMjGI GdGLJeGYjI ai eUQ(B:648 - 923(3g`(B\1250 - 1517(3e OQGSI JGQjNjI hKGFbjI (B/ s - (3eMeO eMeO Gejfs ((3GdbGgQI (B: s (3OGQ GdfgVI GdYQHjI , s, 1980)
Keywords: (3eUQs; (3GdJYdjes; (3GdGMhGd GdGbJUGOjIs; (3GdfXGe GdeGdi ai GdGSdGes; (3GdeOGQSs; (3GdMjGI GdKbGajIs; (3GdeSGLOs; (3GdGhbGas; (3GdMjGI GdOjfjIs; (3GdbVGA ai GdGSdGes; (3GdfXGe GdeGdis; (3GdGSHdIs