@misc{10_1017_S0008439500030964,
     title = {Openings in {Mathematics}},
     journal = {Canadian mathematical bulletin},
     pages = {704--704},
     year = {1969},
     volume = {12},
     number = {5},
     doi = {10.1017/S0008439500030964},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500030964/}
}