@article{00022387, title = {Partial differential equations with piecewise constant delay.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {14}, year = {1991}, pages = {485-496}, doi = {10.1155/S0161171291000674}, zbl = {0745.35002}, language = {en}, url = {http://dml.mathdoc.fr/item/00022387} }
Wiener, Joseph; Debnath, Lokenath. Partial differential equations with piecewise constant delay.. International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991) pp. 485-496. doi : 10.1155/S0161171291000674. http://gdmltest.u-ga.fr/item/00022387/