NeuralNetwork2 academic project - MSI (AI) http://www.robosoup.com/2008/09/sigmoid-function-in-c.html http://galaxy.agh.edu.pl/~vlsi/AI/backp_t/backprop.html http://www-users.mat.umk.pl/~rudy/wsn/wyk/wsn-wyklad-05a-propag.pdf