1. Narlikar, A.V. and Ekbote, S.N., Superconductivity and Superconducting Materials, New Delhi: South Asian Publishers, Madras, 1983.
2. Allen, P.B., Handbook of Superconductivity, New York: Academic Press, 1999.
3. Vora, A.M., Patel, M.H., Mishra, S.R., Gajjar, P.N., and Jani, A.R., Solid State Phys., 2001, vol. 44, p. 345.
4. Gajjar, P.N., Vora, A.M., and Jani, A.R., Mod. Phys. Lett. B, 2004, vol. 18, p. 573.
5. Vora, A.M., Physica C, 2006, vol. 450, p. 135; Physica C, 2007, vol. 458, p. 21; Physica C, 2007, vol. 458, p. 43.