@misc{10_1017_S0008439500031295,
     title = {Problems for {Solution}},
     journal = {Canadian mathematical bulletin},
     pages = {149--154},
     year = {1972},
     volume = {15},
     number = {1},
     doi = {10.1017/S0008439500031295},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500031295/}
}