@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/