@article{00130451,
title = {A focal boundary value problem for difference equations.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {16},
year = {1993},
pages = {169-176},
doi = {10.1155/S0161171293000201},
zbl = {0766.39001},
language = {en},
url = {http://dml.mathdoc.fr/item/00130451}
}
Denny, Cathryn; Hankerson, Darrel. A focal boundary value problem for difference equations.. International Journal of Mathematics and Mathematical Sciences, Tome 16 (1993) pp. 169-176. doi : 10.1155/S0161171293000201. http://gdmltest.u-ga.fr/item/00130451/