(3eONd JGQjNj dOQGSI Mbhb GdEfSGf (B/ s - (3eMehO SdGe RfGJjs ([(3ecGf GdfTQ ZjQ eMOO(B] : s [(3GdfGTQ ZjQ eMOO(B](3, s, 1987)
(3HHdjhLQGajG(B: (3UaMGJ (B279-291.s
Keywords: (3Mbhb GdEfSGfs -- (3bGfhf Ohdjs