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MAYER, K. H., LAUERER, D., & HEITZER, H. (1978). ChemInform Abstract: REACTIONS OF N-ALKOXYCARBONYL-2-AMINOBENZIMIDAZOLES AND -3-AMINOINDAZOLES WITH ALKYL ISOCYANATES. Chemischer Informationsdienst, 9(8). doi:10.1002/chin.197808217 
10.1002/chin.197808217