@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/