Chuangxia Huang Ping Chen Yigang He Lihong Huang Wen Tan Almost sure exponential stability of delayed Hopfield neural networks. 701-705 2008 21 Appl. Math. Lett. 7 http://dx.doi.org/10.1016/j.aml.2007.07.030 db/journals/appml/appml21.html#HuangCHHT08