Wei Wu Baotong Cui Zhigang Zeng Improved Sufficient Conditions for Global Exponential Stability of Recurrent Neural Networks with Distributed Delays. 2029-2037 2008 18 I. J. Bifurcation and Chaos 7 http://dx.doi.org/10.1142/S021812740802152X db/journals/ijbc/ijbc18.html#WuCZ08