@article{AIHPC_2006__23_2_269_0,
     author = {Ekeland, Ivar and Djitt\'e, Ngalla},
     title = {An inverse problem in the economic theory of demand},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {269--281},
     publisher = {Elsevier},
     volume = {23},
     number = {2},
     year = {2006},
     doi = {10.1016/j.anihpc.2005.10.001},
     mrnumber = {2201154},
     zbl = {05024487},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2005.10.001/}
}