Tetsuya Higuchi Masaya Iwata Didier Keymeulen Hidenori Sakanashi Masahiro Murakawa Isamu Kajitani Eiichi Takahashi Kenji Toda Mehrdad Salami Nobuki Kajihara Nobuyuki Otsu Real-world applications of analog and digital evolvable hardware . 220-235 1999 3 IEEE Trans. Evolutionary Computation 3 db/journals/tec/tec3.html#HiguchiIKSMKTTSKO99