1. Phosphorus-Nitrogen Compounds, pp. 66-70, Academic Press, New York (1972).
2. and Mass Spectrometry of Inorganic and Organometallic Compounds, pp. 340-351, Elsevier, New York (1973).
3. and J. Chem. Soc. (A) 392 (1968).
4. Mass spectra of hexachlorotriphosphonitrile and octachlorotetraphosphonitrile
5. and J. Chem. Soc. (A) 1568 (1967).