1. Neural networks and physical systems with emergent collective computational abilities;Hopfield;Proceedings of the National Academy of Sciences of the USA,1982
2. NumPy Community, “NumPy Reference - Release 1.10.0”, November 2014.
3. John Hunter, Darren Dale, Eric Firing, Michael Droettboom, “Matplotlib Release 1.4.2”, October 2014.
4. NeuralNetworkSolutions, “Unsupervised Learning in Neural Networks - Hebbian Principle”, http://www.neuralnetworksolutions.com/nn/unsupervised2.php, access: January 2015.
5. Simplified neuron model as a principal component analyzer;Erkkin Oja;Journal of Mathematical Biology,1982