@article{WL1990,
author = {B. Widrow and  M.A. Lehr},
title = {30 Years of Adaptive Neural Networks: Perceptron and  Madaline and  and Backpropagation},
journal = {Proceedings of the IEEE},
volume = {78},
number = {9},
pages = {1415--1442},
year = {1990}
}