(3dZI GdahQJQGf ahQ(B, (3L (B2 / s - (3GSGeI TYHGfs ([S.N] : (3OGQ GdQGJH GdLGeYjI , s, 1987)
Keywords: (3GddZGJs; (3GdMGSHGJ GdGdcJQhfjIs; (3ahQJQGfs