1. and in Advances in Heterocyclic Chemistry, Vol. 10, ed. by and p. 241. Academic Press, New York (1969).
2. and in Advances in Heterocyclic Chemistry, Vol. 22, ed. by and p. 71. Academic Press, New York (1978).
3. in The Chemistry of Heterocyclic Compounds, Vol. 14, ed. by p. 309. John Wiley, New York (1974).
4. Vibrational spectra of pyrylium, pyrylium-2-d, pyrylium-3-d, and pyrylium-d5 cations
5. VIBRATIONAL SPECTRA OF PYRIDINIUM SALTS