@article{01780261,
title = {Approximate controllability of neutral functional differential system with unbounded delay.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {25},
year = {2001},
pages = {737-744},
doi = {10.1155/S016117120100597X},
zbl = {0995.93009},
language = {en},
url = {http://dml.mathdoc.fr/item/01780261}
}
Park, Jong Yeoul; Kang, Sang Nam. Approximate controllability of neutral functional differential system with unbounded delay.. International Journal of Mathematics and Mathematical Sciences, Tome 25 (2001) pp. 737-744. doi : 10.1155/S016117120100597X. http://gdmltest.u-ga.fr/item/01780261/