Electron ionization mass spectra of phosphorus-containing heterocycles. I. 1,4,4a,5,6,7,8,8a-octahydro-2H-3,1,2-benzoxazaphosphinine 2-oxides - Juhász, Márta; Martiskainen, Olli; Zalán, Zita; Fülöp, Ferenc; Pihlaja, Kalevi (Rapid communications in mass spectrometry, 2006)