( - ) (1894-1940), . . - "" (1915) " " (1915) - . . . . "" (""). , . " " (1925), " " (1929) . 19 .; . , . . "-" (1935) .

.: , , 1969; . . - . [. . ], ., 1961; , ., 1964.

.: ., . ..., .: . . , .,1963; ., , , 1967.

? . . .

: