@incollection{JEDP_1995____A13_0,
     author = {Talenti, Giorgio},
     title = {On complex-valued solutions to a {2D} eikonal equation},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {13},
     pages = {1--6},
     publisher = {Ecole polytechnique},
     year = {1995},
     mrnumber = {1360482},
     zbl = {0876.35024},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1995____A13_0/}
}