[1]Balicki,Roman;Hosmane,RamachandraS.;Leonard,NelsonJ.[JournalofOrganicChemistry,1983,vol.48,#1,p.3-7]
[2]Binev,YuriI;Georgieva,MiglenaK;Novkova,SnezhanaI[SpectrochimicaActaPartA:MolecularandBiomolecularSpectroscopy,2003,vol.59,#13,p.3041-3052]
[3]Bock,Hans;Dammel,Ralph[ZeitschriftfurNaturforschung,B:ChemicalSciences,1987,vol.42,#3,p.315-322]