@article{CRMATH_2010__348_19-20_1099_0,
     author = {Peletier, Mark A. and Veneroni, Marco},
     title = {Non-oriented solutions of the eikonal equation},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1099--1101},
     publisher = {Elsevier},
     volume = {348},
     number = {19-20},
     year = {2010},
     doi = {10.1016/j.crma.2010.09.011},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2010.09.011/}
}