@article{JIS_2015__18_9_a3,
     author = {Mallows, Colin and Vanderbei, Robert J.},
     title = {Which {Young} tableaux can represent an outer sum?},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {18},
     number = {9},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2015__18_9_a3/}
}