Hidalgo, Denisse, et al. “Type-1 and Type-2 Fuzzy Inference Systems As Integration Methods in Modular Neural Networks for Multimodal Biometry and Its Optimization With Genetic Algorithms”. Journal of Automation, Mobile Robotics and Intelligent Systems, vol. 2, no. 1, Jan. 2013, pp. 59-73, https://www.jamris.org/index.php/JAMRIS/article/view/511.