[1]IzvestiyaAkademiiNaukSSSR,SeriyaKhimicheskaya,1952,p.87,91;engl.Ausg.S.97,101
[1]JournalofHeterocyclicChemistry,1992,vol.29,p.1557-1560
[2]Patent:WO2008/35195,2008,A1.Locationinpatent:Page/Pagecolumn47
[3]Patent:US2019/84996,2019,A1.Locationinpatent:Paragraph0373;0375