@article{KYB_2001__37_3_a2, author = {Louisell, James}, title = {Delay differential systems with time-varying delay: new directions for stability theory}, journal = {Kybernetika}, pages = {[239]}, publisher = {mathdoc}, volume = {37}, number = {3}, year = {2001}, mrnumber = {1859083}, zbl = {1265.93221}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_2001__37_3_a2/} }