@article{10_4153_CMB_2013_006_x,
     author = {MacDonald, Mark L.},
     title = {Upper {Bounds} for the {Essential} {Dimensionof} {E} 7},
     journal = {Canadian mathematical bulletin},
     pages = {795--800},
     year = {2013},
     volume = {56},
     number = {4},
     doi = {10.4153/CMB-2013-006-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2013-006-x/}
}