共 32 条
[1]
BAKALOR S., 1948, FARMING IN S AFRICA, V23, P345
[2]
BONNIER G., 1946, Acta agriculturae Suecana, V2, P159
[3]
BROWN LP, 1917, IND ENG CHEM, V9, P297
[8]
HAECKER TL, 1914, MINN AGR EXPT STA B, V140
[9]
Hastings EG, 1937, J AGRIC RES, V54, P0199
[10]
Hastings EG, 1939, J AGRIC RES, V58, P0543