(3GdJHQL GNWQ eYGhd GdgOe hGdJOejQ ai GdeLJeY GdGSdGei (B/ s - (3YcGTI YHOGdefGf GdWjHis ([S.N] : (3ecJHI GdJQGK GdGSdGei , s, 1989)
Keywords: (3GdMLGH hGdSahQs; (3GdJHQLs