(3Odjd ehGO GdYRd GdMQGQj ddeHGfj (B/ s - (3SHY GdYjT, COges; (3YeGQj, HTQs; (3GdUQGa, adcs ((3YeGf (B:s (3GdLeYjg GdYdejg Gdedcjg (B- (3eQcR HMhK GdHfGA,s, 1990)
Keywords: (3ehGO GdHfGAs; (3GdYRd GdMQGQjs