CJCU
Studies on the 1H NMR Spectra of meso and dl diethyl 2,3-dicyano-2,3-bis(p-substituted phenyl)succinates
Yang Di-lun, Qi Chen-ze, Cui Yu-xin, Dang Hai-shan, Liu You-cheng
Chem. J. Chinese Universities . 1991, (12): 1627 -1630 .