@article{CMUC_1994__35_2_a9,
     author = {Mal\'y, Jan},
     title = {The area formula for $W^{1,n}$-mappings},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {291--298},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {1994},
     mrnumber = {1286576},
     zbl = {0812.30006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1994__35_2_a9/}
}