@article{10_4153_CJM_1980_080_5,
     author = {Browne, Patrick J. and Nillsen, Rodney},
     title = {The {Two-Sided} {Factorization} of {Ordinary} {Differential} {Operators}},
     journal = {Canadian journal of mathematics},
     pages = {1045--1057},
     year = {1980},
     volume = {32},
     number = {5},
     doi = {10.4153/CJM-1980-080-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-080-5/}
}