@article{AFST_2007_6_16_1_71_0,
     author = {Dacorogna, Bernard and Mar\'echal, Pierre},
     title = {Convex $\operatorname{SO}(N)\times \operatorname{SO}(n)$-invariant functions and refinements of von {Neumann{\textquoteright}s} inequality},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {71--89},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 16},
     number = {1},
     year = {2007},
     doi = {10.5802/afst.1139},
     mrnumber = {2325592},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/afst.1139/}
}