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Baldwin, M.A.; Loudon, A.G.; Dunmur, R.E.; Schmutzler, R.; Gregor, I.K., Charge location and fragmentation under electron impact. IV-The behaviour under electron impact of some N-methyl, N'-R-1,2,4-phosphadiazetidine-3-ones and related compounds, Org. Mass Spectrom., 1977, 12, 275. [all data]