Coulson, Charles Alfred 1910-1974. Dictionary of [symbol for pi]-electron calculations / by C.A. Coulson and A. Streitwieser, Jr. ; With extensive help from M.D. Poole and J.I. Brauman. - Oxford : Pergamon Press, 1965. - xxx, 357 p. ill. References: p. 349-355. Subjects--Topical Terms: Molecular orbitals.