Hongtao Lu Ruimin Shen Fu-Lai Chung Absolute exponential stability of a class of recurrent neural networks with multiple and variable delays. 103-119 2005 344 Theor. Comput. Sci. 2-3 http://dx.doi.org/10.1016/j.tcs.2005.02.006 db/journals/tcs/tcs344.html#LuSC05