@article{10_1017_S0008439500030307,
     author = {Clark, Colin},
     title = {Problems and solutions in ordinary differential equations, by {F.} {Brauer} and {J.} {A.} {Nohel.} {W.} {A.} {Benjamin,} {Inc.,} {New} {York,} 1968.},
     journal = {Canadian mathematical bulletin},
     pages = {245--246},
     year = {1969},
     volume = {12},
     number = {2},
     doi = {10.1017/S0008439500030307},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500030307/}
}