Citation: L. Dubois et al., PREPARATION OF BETA-SUBSTITUTED TRYPTOPHAN DERIVATIVES - COMPARISON OF THE REACTIVITY OF N-METHYLINDOLE TOWARD AZIRIDINE-2-LACTONES AND AZIRIDINE-2-CARBOXYLIC ESTERS AND INTERPRETATION OF RESULTS USING MNDO CALCULATIONS, Journal of organic chemistry, 59(2), 1994, pp. 434-441