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Ackman, R. G.; Dytham, R. A.; Wakefield, B. J.; Weedon, B. C. L. (1 January 1960). "Organic reactions in strong alkalis-II: Fission of di-ethylenic and acetylenic acids". Tetrahedron. 8 (3): 239–245. doi:10.1016/0040-4020(60)80032-4. ISSN0040-4020.