共 28 条
[21]
MUNSINGER RA, 1982, AM LAB, V14, P76
[22]
NELSON DW, 1980, J ASSOC OFF ANA CHEM, V63, P770
[23]
DETERMINATION OF TOTAL NITROGEN IN PLANT MATERIAL
[J].
AGRONOMY JOURNAL,
1973, 65 (01)
:109-112
[28]
URANIO GA, 1979, ASTM STANDARDIZATION, V7, P8