We present an extension of the results given in the first part of this paper (2004) referring to the existence in the D case of a free boundary between the saturated and unsaturated domains that may be evidenced during the water flow into a porous medium.
"A free boundary problem describing the saturated-unsaturated flow in a porous medium. Part II. Existence of the free boundary in the 3D case." Abstr. Appl. Anal. 2005 (8) 813 - 854, 16 October 2005. https://doi.org/10.1155/AAA.2005.813