1. M. Murakami,Melt Processed High-Temperature Superconductors, Singapore World Scientific 1993) p. 224.
2. C.K. McMichael, R.S. Cooley, Q.Y. Chen, K.B. Ma, M.A. Lamb, R.L. Meng, C.W. Chu and W.K. Chu,Proc. 2nd Int. Symp. on Magnetic Suspension Technol., Seattle 1993.
3. H.J. Bornemann, R. Zabka, P. Boegler, C. Urban and H. Rietschel,Proc. 2nd Int. Symp. on Magnetic Suspension Technol., Seattle 1993.
4. J.R. Hull, and R.B. Poeppel,HTS Materials Bulk Proc. and Bulk Appl.. Singapore, River Edge, N.J.: World Scientific, 1992), p. 484.
5. S. Sengupta, S. Shi, J.S. Luo, A. Buzdin, V. Gorin, V.R. Todt, C. Varanasi and P.J. McGinn, preprint, 1994.