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The authors are members of G.N.A.F.A.-C.N.R.
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Carbone, L., Valli, A. Filtration through a porous non-homogeneous medium with variable cross section. J. Anal. Math. 33, 191–221 (1978). https://doi.org/10.1007/BF02790173
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DOI: https://doi.org/10.1007/BF02790173