Ágai, B. et al. 1974. PYRIMIDINES AND CONDENSED DERIVATIVES, III* THE SYNTHESIS OF SOME ISOCYTOSINES AND RELATED IMIDAZO[1,2-a]- AND -[1,2-c ]PYRIMIDINONES Periodica Polytechnica Chemical Engineering. 18, 1 (Jan. 1974), 47–72.