(3LeGd GdbQBf hceGd GdEbQGA (B/s - (3GdSNGhj, Ydj Hf eMeO Hf YHO GdUeO,s 558-643 (3gLQjG(B.s; (3GdHhGH, Ydj MSjfs ((3ecI GdecQeI (B:s (3ecJHI GdJQGK,s, 1987)
Keywords: (3GdbQBfs -- (3bQGAGJs; (3GdbQBfs -- (3JLhjOs; (3bQBfs -- (3GdLeGd aj GdbQBfs