1. Ring Transformations of Heterocycles (vol. 1 & 2), Academic Press, London and New York 1973. - Page numbers quoted within the captions to single chapters refer to vol. 1 unless otherwise indicated
2. in: Heterocyclic Compounds, vol. 8 (ed. ), Wiley, New York etc. 1967, p. 1
3. in: Methoden der organischen Chemie (Houben-Weyl), 4th ed., vol. E 8d (ed. ), Thieme, Stuttgart 1994, p. 664
4. Recent Advances in Tetrazole Chemistry
5. in: Comprehensive Heterocyclic Chemistry (eds. ), Pergamon, Oxford, 1984, vol. 5, p. 791;