Baiocchi, C.; Comincioli, V.; Magenes, E.; Pozzi, G.A. (1973). "Free boundary problems in the theory of the fluid through porous media: existence and uniqueness theorems". Ann. Mat. Pura Appl. 96 (4): 1–82. doi:10.1007/BF02414909. S2CID119934268.
Baiocchi, C.; Comincioli, V.; Magenes, E.; Pozzi, G.A. (1973). "Free boundary problems in the theory of the fluid through porous media: existence and uniqueness theorems". Ann. Mat. Pura Appl. 96 (4): 1–82. doi:10.1007/BF02414909. S2CID119934268.