@article{MM2_1993__78_4_155807,
     author = {M. Giaquinta and G. Modica and J. Soucek},
     title = {Graphs of finite mass which annot be approximated in area by smooth graphs.},
     journal = {Manuscripta mathematica},
     pages = {259--272},
     publisher = {mathdoc},
     volume = {78},
     number = {4},
     year = {1993},
     zbl = {0796.58006},
     url = {http://geodesic.mathdoc.fr/item/MM2_1993__78_4_155807/}
}