Bibliografisk träff 1997-01-01 Fast-atom bombardment mass spectrometry for mapping of endogenous methylated purine bases in urine extracts. Porcelli B, Muraca LF, Frosi B, Marinello E, Vernillo R, De Martino A, Catinella S, Traldi P. Rapid Commun Mass Spectrom · journal article · DOI 10.1002/(sici)1097-0231(19970228)11:4<398::aid-rcm807>3.0.co;2-m