LEMPERT, K. et al. 1964. HYDANTOINS, THIOHYDANTOINS, GLYKOCYAMIDINES. XVll : THE REACTION OF S,S’-DIMETHYL-5,5-DIPHENYL-DITHIOHYDANTOIN AND S-METHYL-5,5-DIPHENYL-4-THIOHYDANTOIN WITH OXO REAGENTS AND POTASSIUM HYDROGENE SULFIDE. Periodica Polytechnica Chemical Engineering. 8, 1 (Jan. 1964), 21–28.