(3GdbUO GdLfGFi GdNGU (B:s (3OQGSI JMdjdjI JWHjbjI (B/s - (3MSfjf YHjOs ((3GdbGgQI (B:s {(3GdfGTQ ZjQ eMOO(B}s, 1981)
(3jTJed Ydj GQLGYGJ HHdjhLQGajI(B.s
(3GdfU CZdHg HGddZI GdYQHjI eY HYV GdfUhU GdEfLdjRjIs
Keywords: (3GdbUO GdLfGFj (B= (3GdYeOs; (3GdbGfhf GdLfGFjs