(3QSGFd adSajI (B/ s - (3GdTeGY, UGdMs; (3GdJcQjJj, fGLjs ((3HZOGO (B:s (3hRGQI GdKbGaI h GdGYdGe(B-(3OGQ GdTDhf GdKbGajI GdYGeI,s, 1989)
Keywords: (3GdadSaIs; (3GdQSGFds