?url_ver=Z39.88-2004&rft_id=MTMT%3A28003+10.1002%2Frcm.1290080709&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=+M%C3%A4ki+Esa&rft.aulast=M%C3%A4ki&rft.aufirst=Esa&rft.issn=0951-4198&rft.issue=7&rft.atitle=Electron+ionization+mass+spectra+of+some+fused+pyrimidinone+derivatives&rft.pages=535-538&rft.date=1994&rft.volume=8&rft.title=RAPID+COMMUNICATIONS+IN+MASS+SPECTROMETRY&rft.genre=article