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2. C. Panagopoulos and T. Xiang, “Relationship between the superconducting energy gap and the critical temperature in high temperature superconductors”, Physical Review Letters 81 (1998) 2336-2339.
3. C. Panagopoulos, J. R. Cooper, and T. Xiang, “Systematic behavior of the in-plane penetration depth in d-wave cuprates”, Physical Review B 57 (1998) 13422-13425. Cond-mat/9712189.
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8. T. Xiang, C. Panagopoulos, J. R. Cooper, “c-axis electronic structure and superfluid response of copper oxide superconductors”, Research Review of High Temperature Superconductivity, University of Cambridge (Editor W Y Liang) (1998) 7-14.