(3GdGhGFd (B/ s - (3GHh gdGd GdYScQj, GdMSf Hf YHO Gddg Hf Sgd, s (3Jhaj HYO (B395 (3gLQj, s ((3HjQhJ, dHfGf (B: s (3OGQ GdcJH GdYdejI, (B407 (3g`(B. = 1987.s, 1987)
Keywords: (3GdMVGQI GdGSdGejIs -- (3JGQjN(B.s; (3GdMVGQI GdYQHjI(B.s