@article{ASNSP_1977_4_4_1_33_0,
     author = {Torelli, Alessandro},
     title = {On a free boundary value problem connected with a non steady filtration phenomenon},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {33--59},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 4},
     number = {1},
     year = {1977},
     mrnumber = {443564},
     zbl = {0354.76069},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1977_4_4_1_33_0/}
}