LUGOSI, P., ÁGAI, B., HORNYÁK, G. “SYNTHESIS AND RING CLOSURE REACTIONS OF SOME N-(o-AMINOPHENYL)-N-METHYL-N’,N"-DISUBSTITUTED-GUANIDINES AND OF N-(2-AMINO-4-METHOXYPHENYL)-N-METHYL-N’-PHENYLTHIOUREA)”, Periodica Polytechnica Chemical Engineering, 19(4), pp. 307–316, 1975.