(3aj GdTYQ GdGfOdSj (B/ s - (3eUWai, YOfGf UGdM, s ((3GdOhMI, bWQ (B: s (3OGQ GdKbGaI, (B407 (3g`(B. = 1987.s, 1987)
(3jJVef GQLGYGJ HHdjhLQGajI (B: (3UaMI (B163-167.s
Keywords: (3GdTYQ GdYQHjs -- (3JGQjN hfbOs -- (3GdYUQ GdGfOdSj, (B711-1516.s