1. The lower electronic levels of the radicals CH, CH2, CH3, NH, NH2, BH, BH2and BH3
2. Hugh Christopher Longuet–Higgins. 11 April 1923 — 27 March 2004
3. For the benefit of American readers of this chapter, Leckhampton was not a prison, and Longuet-Higgins was not a “warden”. Had Leckhampton been an independent Cambridge College, rather than the graduate hostel of Corpus Christi College, Professor Longuet-Higgins might have been called the “Master” of Leckhampton College.
4. Anders, U. “Interview with Professor John Murrell,”http://www.quantum-chemistry-history.com.
5. Stereochemistry of Electrocyclic Reactions