@article{AIHPC_2003__20_6_1075_0,
     author = {de Lellis, Camillo and Westdickenberg, Michael},
     title = {On the optimality of velocity averaging lemmas},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {1075--1085},
     publisher = {Elsevier},
     volume = {20},
     number = {6},
     year = {2003},
     doi = {10.1016/S0294-1449(03)00024-6},
     mrnumber = {2008689},
     zbl = {1041.35019},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/S0294-1449(03)00024-6/}
}