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Pre One:S. Sun, Y. G. Liu, W. C. Chew, and Z. Ma, "Calderon multiplicative preconditioned EFIE with perturbation method," IEEE Transactions on Antennas and Propagation, vol. 61, no. 1, pp. 247-255, Jan. 2013. [DOI:10.1109/TAP.2012.2220099]
Next One:S. S. Gao and S. Sun, "A compact dual-mode balun bandpass filter with improved upper stopband performance," Electronics Letters, vol. 47, no. 23, pp. 1281-1283, Nov. 2011. [DOI:10.1049/el.2011.2879]