    (. 1928) -  ,   (1991;     1990).
 B 1952    .
 C 1961  1981 .   .
 B 1994   .
      , ,   ,  .

 ------------------------------------------------------------------------------

     6  1928   .
  1951      ,  1952  -     .    ,        .
       1952       .    ,    .
  1953-1957   ,     ,  1957  -   ,   1961         .
  1981  -        ,  1986 -   .  1990  -    ,  1991 -   .
         ,    ,       ,          . ..         ,    .
  2009       .