1. Nesmeyanov, A.N.; Semin, G.K.; Saatsazov, V.V.; Babushkina, T.A.; Burbelo, V.M.; Lisichkina, I.N.; Khotsyanova, T.L.; Tolstaya, T.P.:Dokl Akad Nauk SSSR 237(1977),395
2. Ludwig, G.W.:J Chem Phys 25(1956),159
3. Pies, W.; Weiss, A.:J Magn Reson 30(1978),469
4. Aleksandrov, A.L.; Ignatov, B.G.; Klebanov, A.V.; Semin, G.K.:Zavod Lab 40(1974),966
5. Semin, G.K.:Zh Strukt Khim 3(1962),292