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2. E. L. Ruff , in Methods of Organic Chemistry (Houben-Weyl). Carbocyclic Four-Membered Ring Compounds , ed. A. de. Meijere , Thieme Verlag , Stuttgart , 1997 , vol. E17e, pp. 118–140
3. The chemistry of cyclobutanes , ed. Z. Rappoport and J. F. Liebman , John Wiley & Sons Ltd , The Atrium, Southern Gate, Chichester , 2005 , and most pertinent references therein
4. How cyclobutanes are assembled in nature – insights from quantum chemistry
5. Bioactive cyclobutane-containing alkaloids