@article{10_4153_CMB_1998_046_3,
     author = {Codec\`a, P. and Nair, M.},
     title = {Extremal {Values} of},
     journal = {Canadian mathematical bulletin},
     pages = {335--347},
     year = {1998},
     volume = {41},
     number = {3},
     doi = {10.4153/CMB-1998-046-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1998-046-3/}
}