Mass spectrometry of heterocyclic compounds [by] Q. N. Porter [and] J. Baldas. Porter, Q. N. (Quentin Noel) Baldas, J., joint author. Mass spectrometry. Heterocyclic compounds Spectra. QD271 .P67 547.59046 19 POM Includes bibliographies. New York, Wiley-Interscience [1971] [1971] 1971 Text xvii, 564 p. : eng General heterocyclic chemistry series