@article{10_4153_CMB_1969_048_x,
     author = {Bruckner, A. M.},
     title = {Some {Remarks} on {Extreme} {Derivates}},
     journal = {Canadian mathematical bulletin},
     pages = {385--388},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.4153/CMB-1969-048-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-048-x/}
}