(3bGfhf GdYbhHGJ GdNGU (B:s (3LQGFe GdQThI hGdENdGd HGdKbI GdYGeI (B/s - (3LYaQ, Ydj eMeOs ((3HjQhJ (B:s (3eLO GdeDSSI GdLGeYjI ddOQGSGJ hGdfTQ hGdJhRjY,s, 1987)
Keywords: (3LQGFe GdCehGds -- (3dHfGfs; (3GdQThIs -- (3bhGfjf hJTQjYGJs -- (3dHfGfs; (3bGfhf GdYbhHGJs -- (3dHfGfs