@article{COCV_2008__14_4_802_0,
     author = {Davini, Cesare and Paroni, Roberto},
     title = {External approximation of first order variational problems via $W^{-1, p}$ estimates},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {802--824},
     publisher = {EDP-Sciences},
     volume = {14},
     number = {4},
     year = {2008},
     doi = {10.1051/cocv:2008011},
     mrnumber = {2451798},
     zbl = {1154.65054},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/cocv:2008011/}
}