no. 1
Weak solutions to general Euler's equations via nonsmooth critical point theory
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 9 (2000) no. 1, pp. 113-131. 
@article{AFST_2000_6_9_1_113_0,
     author = {Squassina, Marco},
     title = {Weak solutions to general {Euler's} equations via nonsmooth critical point theory},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {113--131},
     publisher = {Universit\'e Paul Sabatier. Facult\'e des sciences},
     address = {Toulouse},
     volume = {Ser. 6, 9},
     number = {1},
     year = {2000},
     mrnumber = {1815943},
     zbl = {0983.35050},
     language = {en},
     url = {http://www.numdam.org/item/AFST_2000_6_9_1_113_0/}
}
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Squassina, Marco. Weak solutions to general Euler's equations via nonsmooth critical point theory. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 9 (2000) no. 1, pp. 113-131. http://www.numdam.org/item/AFST_2000_6_9_1_113_0/

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