. (Lonsdale, Smith, 1941; Lonsdale, 1942; Grenville-Wells, 1951; Hoerni,, Wooster, 1955; Frank, 1956; Sirkar, Sen, 1956; Caticha-Ellis, Cochran, 1958; Lonsdale, Milledge, 1965; , 1964; , . ., 1965; , , , 1967).

. . (Frank, 1956) , , , , {100}. , , (Caticha-Ellis, Cochran, 1958) , , . (Kemmey, Mitchell, 1960; Elliott, I960), ,