(3GdefRd Ph GdTQaGJ GdSHY (B: s (3chejOjG ShOGA ef KdGKI aUhd (B((3eSQMjI(B) / s - (3cGShfG, GdNGfOQhs ((3GdbGgQI (B: s (3GdeLdS GdhWfi ddKbGaI hGdafhf hGdGOGH , s, 1990)
Keywords: (3GdeSQMjGJs; (3GdeSQM (B- (3GSHGfjGs