共 8 条
[1]
JACKSON R. K., 1956, PROC AMER SOC HORT SCI, V68, P1
[2]
JENTZSCH D, 1955, Z ANAL CHEM, V144, P17
[4]
KEATON CM, 1937, SOIL SCI, V43, P410
[5]
KOLTHOFF IM, 1948, PHET, P35
[8]
1955, OFFICIAL METHODS ANA, P110