(3SbhW GdGdgI (B20 (3ObjbI (B/ s - (3eMeO NjQi(B((3eNQL(B)s; (3eMeO Ndjd fUQ (B((3eUhQ(B)s; (3HOhi JQci (B((3JUhjQ(B)s ([S.N] : (3GdeQcR Gdbhei ddSjfeG , s, 1987)
Keywords: (3TQGFW ajOjhs; (3GadGe JSLjdjIs