TY - SER AU - Tolosa,Imma AU - Ogrinc,Nives TI - Utility of 5 A molecular sieves to measure carbon isotope ratios in lipid biomarkers N1 - YA2008 M06 D01 Sources - Journal of Chromatography A Sources - 1165 (1-2) 2007 : 172-181 ISSN - 0021-9673 ER -