1. M.N.Wilson, “Superconducting Magnets”, Clarendon Press, Oxford (1983).
2. J.E.C.Williams, “Superconductivity and its applications”, Pion Limited, London (1970).
3. V.E.Keilin, Simple equation of the critical surface of second - kind rigide superconductors, Dok. Akad. Nauk SSSR (Sov. Phys. Dokl.) 1:90 (1982).
4. V.E.Keilin et al, Development of superconducting solenoids from multifilamentary niobium - tin wires without stabilizing matrix and analysis of their thermal stability, Cryogenics, 25:462 (1985).
5. S.A.Elrod et al, The specific heat of NbTi from 0 to 7T between 4.2 and 20K, “Advances in Cryogenic Engineering”, Vol. 28, Plenum Press, New York (1982), p. 601.