共 4 条
[1]
CLAPHAM AR, 1946, J ECOL, V33, P308
[2]
Hegi G., 1906, ILLUSTRIERTE FLORA M
[3]
MCCOY JW, 1947, IND ENG CHEM ANAL ED, V19, P1002
[4]
MEHLICH A, 1946, SOIL SCI, V62, P392