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Communicated by J. B. McLeod
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van Duyn, C.J. Nonstationary filtration in partially saturated porous media: Continuity of the free boundary. Arch. Rational Mech. Anal. 79, 261–265 (1982). https://doi.org/10.1007/BF00251906
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DOI: https://doi.org/10.1007/BF00251906