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Houk، KN؛ Lin، YT؛ Brown، FK (1986). "Evidence for the concerted mechanism of the Diels-Alder reaction of butadiene with ethylene". J. Am. Chem. Soc. ج. 108 ع. 3: 554–6. DOI:10.1021/ja00263a059. PMID:22175504.