[1]Duff[JournaloftheChemicalSociety,1945,p.276]
[1]Duff[JournaloftheChemicalSociety,1945,p.276]
[1]CurrentPatentAssignee:Geigy&Co.-DE103578,1800,C[Fortschr.Teerfarbenfabr.Verw.Industriezweige,vol.5,p.101][Fortschr.Teerfarbenfabr.Verw.Industriezweige,vol.5,p.101]
[1]Duff[JournaloftheChemicalSociety,1945,p.276]
[1]Vilsmeier;Haack[ChemischeBerichte,1927,vol.60,p.121]