@article{CRMATH_2008__346_3-4_189_0,
     author = {Peter Hornung},
     title = {Approximating $ {W}^{2,2}$ isometric immersions},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {189--192},
     publisher = {Elsevier},
     volume = {346},
     number = {3-4},
     year = {2008},
     doi = {10.1016/j.crma.2008.01.001},
     language = {en},
}