Wyman R. Vaughan and K. S. Andersen
The Steric Factor in the Diels-Alder Reaction. II. Anthracene with Alkylmaleic Anhydrides and Alkylfumaric acids
J. Org. Chem. Vol. 21, No. 6: June 1956 pp 673 - 683;
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http://dx.doi.org/10.1021/jo01112a023