(3OQGSI aj fXQjI GdGShGb (B/ s - (3ehSi, GMeO QTGO, s ((3GdbGgQI (B[(3eUQ(B] : s (3eYgO GdHMhK hGdOQGSGJ GdYQHjI, (B391 (3g`(B. = 1971.s, 1971)
(3jJVef GQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdGMJcGQ(B.s; (3GdGShGbs -- (3GdLhGfH GdGbJUGOjI(B.s; (3GdGSYGQ(B.s