@article{10_4153_CMB_1968_084_0,
     author = {Seminar, D. E.},
     title = {Some {Elementary} {Converse} {Problems} in {Ordinary} {Differential} {Equations*}},
     journal = {Canadian mathematical bulletin},
     pages = {703--716},
     year = {1968},
     volume = {11},
     number = {5},
     doi = {10.4153/CMB-1968-084-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-084-0/}
}