Maki Esa;  Pihlaja Kalevi;  Huber Imre;  Fülöp Ferenc;  Bernáth Gábor;  Vainiotalo Pirjo: Electron impact ionization mass spectra of some substituted dipyrido[1,2-a:4,3-d]pyrimidinones.
  ORGANIC MASS SPECTROMETRY, 28 (1).  pp. 18-22.  ISSN 0030-493X (1993)