@article{SEDP_1970-1971____A17_0,
     author = {Ehrenpreis, Leon},
     title = {Analyse de Fourier sur des ensembles non-convexes},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique)},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1970-1971},
     note = {talk:17},
     zbl = {0239.42030},
     mrnumber = {390758},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1970-1971____A17_0}
}

Ehrenpreis, Léon. Analyse de Fourier sur des ensembles non-convexes. Séminaire Équations aux dérivées partielles (Polytechnique) (1970-1971), Talk no. 17, 3 p. http://www.numdam.org/item/SEDP_1970-1971____A17_0/