@article{10_4153_CMB_2008_016_5,
     author = {Rossi, Julio D.},
     title = {First {Variations} of the {Best} {Sobolev} {Trace} {Constant} with {Respect} to the {Domain}},
     journal = {Canadian mathematical bulletin},
     pages = {140--145},
     year = {2008},
     volume = {51},
     number = {1},
     doi = {10.4153/CMB-2008-016-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2008-016-5/}
}