N.Y. Ermolova and B. Makarevich, “Power and subcarrier allocation algorithms for OFDM systems,” in Proc. IEEE 16-th International Symposium on Personal, Indoor and Mobile Radio Communications, pp.352–356, 2005.
 L. Goldfeld and V. Lyandres “Minimum power loading strategy for multicarrier system in the capacity constrained frequency selective channel,” Electronic Letters, Vol. 41, No. 25, pp. 1386–1388, December 2005.
 C. Mutti, D. Dahlhaus and T. Hunziker, “Optimal power loading for multiple-input single-output OFDM systems with bit level interleaving,” IEEE Transaction on Wireless Communications, Vol. 5, pp. 1886–1895, May 2006.