(3CSHGH GdfRhd (B/s - (3GdhGMOj, Ydj Hf CMeO Hf eMeO,s (3J(B. 468 (3g`(B.s; (3GdLejdj, GdSjO EHQGgjes ((3HjQhJ (B:s (3OGQ GdcJGH GdYQHj,s, 1990)
Keywords: (3GdbQBfs -- (3CSHGH GdfRhds