O. Zwaagstra

Stable isotopic signatures (δ13C, δD) of methane from European landfill sites

P. Bergamaschi, H. Fischer, C. Lubina, 1998 .

Sample preparation for radiocarbon (14C) measurements of carbonyl compounds in the atmosphere: quantifying the biogenic contribution

O. Zwaagstra, D. Kotzias, B. Larsen, 1998 .