(3Mb GdJdGhI (B: s (3cJGH efgLj JWHjbj dJYde JLhjO GdbQBf h JYdjeg Ydi QhGjI MaU Yf YGUW h HMGTjJg GdcJGH GdbhGYO GdJj jNGda ajgGMaUkG cd GdQhGI bGdhf (B- (3hhQT (B-(3h GdOhQj (B/ s - (3YKeGf, MSfj TjNs ((3GdeDda,s, 1990)
Keywords: (3GdESdGes; (3GdYdhe GdbQBfjIs; (3CMcGe GdJLhjOs