@article{JRAM_1973__260_151309,
     author = {Paul Lewis},
     title = {Variational semi-regularity and norm convergence.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {21--30},
     publisher = {mathdoc},
     volume = {260},
     year = {1973},
     zbl = {0265.46047},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__260_151309/}
}