(3GdLMje (B/ s - (3LhQL WQGHjTi (B((3eJQLe(B)s; (3HGQjhS, gfQis ((3HjQhJ (B: s (3efThQGJ OGQ GdGOGH , s, 1971)
Keywords: (3GdGOHs; (3GdbUU GdGfLdjRjI GdeJQLeIs; (3GdGOH GdYGdei GdeJQLes