@misc{10_1017_S000843950003040X,
     title = {Problems for {Solution}},
     journal = {Canadian mathematical bulletin},
     pages = {354--355},
     year = {1969},
     volume = {12},
     number = {3},
     doi = {10.1017/S000843950003040X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S000843950003040X/}
}