1. u. : Cyclobutadiene and Related Compounds. Academic Press, New York 1967;
2. in Houben-Weyl-Müller: Methoden der Organischen Chemie. Thieme, Stuttgart 1971, Bd. IV/4, S. 231.
3. Ground states of conjugated molecules—V
4. A study of condensed cyclobutadienes by a variable-beta hückel scheme