(3JbQjQ(B:s (3MdbI OQGSjI dMbhb GdEfSGf(B/s - (3YGFTI QGJHs ((3eUQ(B:s (3GdeLdI GdeUQjI ddbGfhf GdOhdj(B,s, 1969)
(3GdYOO Gd(B25 (3ef GdeLdI GdeUQjI ddbGfhf GdOhdjs
Keywords: (3GdbGfhf GdOhdj GdYGes; (3Mbhb GdEfSGfs