Xiaoming Chen Zheng Tang Catherine Vairappan Songsong Li Toshimi Okada A modified error backpropagation algorithm for complex-value neural networks. 435-443 2005 15 Int. J. Neural Syst. 6 http://dx.doi.org/10.1142/S0129065705000426 db/journals/ijns/ijns15.html#ChenTVLO05