@article{1077467918,
author = {Duffin, R. J. and Shelly, E. P.},
title = {Difference equations of polyharmonic type},
journal = {Duke Math. J.},
volume = {25},
number = {1},
year = {1958},
pages = { 209-238},
language = {en},
url = {http://dml.mathdoc.fr/item/1077467918}
}
Duffin, R. J.; Shelly, E. P. Difference equations of polyharmonic type. Duke Math. J., Tome 25 (1958) no. 1, pp. 209-238. http://gdmltest.u-ga.fr/item/1077467918/