Duong, Anh Tuan, and Thi Loan Tran. 2008. “Global Exponential Stability of a Class of Neural Networks With Unbounded Delays”.
Ukrains’kyi Matematychnyi Zhurnal
60 (10): 1401–1413.
https://umj.imath.kiev.ua/index.php/umj/article/view/3254
.