共 35 条
- [21] ISOTOPIC VARIATIONS OF NITROGEN IN LAKE-SUPERIOR [J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1977, 41 (06) : 811 - 814
- [24] RAU GH, UNPUBLISHED
- [25] N-15 NATURAL ABUNDANCE IN OCEANIC SUSPENDED PARTICULATE MATTER [J]. NATURE, 1980, 283 (5749) : 752 - 754
- [26] Shearer G, 1978, RECENT DEV MASS SPEC, V1, P605
- [28] STUMP RK, 1973, NUCL SCI ABSTR, V28, P746
- [30] Sweeney RE., 1978, STABLE ISOTOPES EART, P9