@article{AIHPB_2005__41_4_753_0,
     author = {Harg\'e, Gilles},
     title = {Characterization of equality in the correlation inequality for convex functions, the $U$-conjecture},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {753--765},
     publisher = {Elsevier},
     volume = {41},
     number = {4},
     year = {2005},
     doi = {10.1016/j.anihpb.2004.05.005},
     mrnumber = {2144232},
     zbl = {1070.60018},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpb.2004.05.005/}
}