@article{CRMATH_2007__344_5_305_0,
     author = {Ciarlet, Philippe G. and Ciarlet, Patrick Jr. and Geymonat, Giuseppe and Krasucki, Fran\c{c}oise},
     title = {Characterization of the kernel of the operator {CURL\,CURL}},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {305--308},
     publisher = {Elsevier},
     volume = {344},
     number = {5},
     year = {2007},
     doi = {10.1016/j.crma.2007.01.001},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2007.01.001/}
}