1. McCarty C.J.: Chemistry of the C=N Double Bond (Patai S., ed.), chap. 9. London: Interscience 1970.
2. Alberti A., Barbaro G., Battagglia A., Guerra M., Pedulli G.F.: J. Org. Chem.46, 742 (1981)
3. Il’yasov A.V., Levin Ya.A., Mukhtarov A.Sh., Skorobogatova M.S.: Izv. Acad. Nauk SSSR, Ser. Khim.1975, 1654.
4. Il’yasov A.V., Kargin Yu.M., Morozova I.D.: ESR Spectra of Organic Radical Ions. Moscow: Nauka 1980.
5. Il’yasov A.V., Kadirov M.K., Kargin Yu.M., Eichhoff U.: Bruker Rep.2, 20 (1987)