@article{10_4153_CMB_1970_064_9,
     author = {Long, Calvin T.},
     title = {On a {Problem} in {Partial} {Difference} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {333--335},
     year = {1970},
     volume = {13},
     number = {3},
     doi = {10.4153/CMB-1970-064-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-064-9/}
}