David I. Schuster, Arthur C. Fabian, Noland P. Kong, William C. Barringer, William V. Curran, David H. Sussman,
Photochemistry of unsaturated ketones in solution. XVIII. Efficiencies of quenching of short-lived excited triplet states of ketones with dienes Journal of the American Chemical Society. ,vol. 90, pp. 5027- 5028 ,(1968) ,
10.1021/JA01020A048