On complex-valued solutions to a 2D eikonal equation
Journées équations aux dérivées partielles (1995), article no. 13, 6 p. 
@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/}
}
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Talenti, Giorgio. On complex-valued solutions to a 2D eikonal equation. Journées équations aux dérivées partielles (1995), article  no. 13, 6 p. http://www.numdam.org/item/JEDP_1995____A13_0/