(3eYLe GdeDdajf(B: (3JQGLe eUfai GdcJH GdYQHjI (B/ s - (3YeQ QVG cMGdIs ((3HjQhJ (B: s (3dLfI GdGYdGe hGdOQGSGJ GdeSJbHdjI , s, 1957)
Keywords: (3GdJQGLes; (3GdQLGd (B- (3JQGLes