@article{10_4153_CJM_1983_050_2,
     author = {Browne, Patrick J. and Nillsen, R. V.},
     title = {On {Difference} {Operators} and their {Factorization}},
     journal = {Canadian journal of mathematics},
     pages = {873--897},
     year = {1983},
     volume = {35},
     number = {5},
     doi = {10.4153/CJM-1983-050-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1983-050-2/}
}