1. Kamiya, T. 1976.Recent Advances in the Chemistry of β-Lactam Antibiotics, 287–294. Cambridge: Chemical Society.
2. Backes, J. 1991.Houben-Weyl, Methoden der Organischen Chemie, Org. Stickstoffverbindungen II, Edited by: Klamann, D. 226–440. Stuttgart: Bnd. E 16b, George Thieme Verlag.
3. Koppel, G. A. 1983.Heterocyclic Compounds, Edited by: Hassner, A. Vol. 42, 302John Wiley and Sons.
4. Reactions of phenyl isocyanate with vinyl ethers