@article{10_4153_CJM_1977_042_8,
     author = {Mary, Donald F. St.},
     title = {On {Transformation} and {Oscillation} of {Linear} {Differential} {System}},
     journal = {Canadian journal of mathematics},
     pages = {392--399},
     year = {1977},
     volume = {29},
     number = {2},
     doi = {10.4153/CJM-1977-042-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-042-8/}
}