(3GHf gQeI GdbQTi(B: (3Hjf GdOhdJjf GdGehjI hGdYHGSjI (B/ s - (3Ydi GSeGYjds ([S.N] : (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 1990)
Keywords: (3GdJQGLe GdGOHjIs; (3GdJQGLes; (3GdTYQGAs; (3GHf gQeI GdbQTis