no. 2

On the capillarity problem with constant volume
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 2 (1975) no. 2, pp. 303-320. 
@article{ASNSP_1975_4_2_2_303_0,
     author = {Gerhardt, Claus},
     title = {On the capillarity problem with constant volume},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {303--320},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 2},
     number = {2},
     year = {1975},
     zbl = {0321.76010},
     mrnumber = {390897},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1975_4_2_2_303_0/}
}
Gerhardt, Claus. On the capillarity problem with constant volume. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 2 (1975) no. 2, pp. 303-320. http://www.numdam.org/item/ASNSP_1975_4_2_2_303_0/

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