@article {MR2246067,
    AUTHOR = {Schaerer, C. E. and Sarkis, M. and Marchesin, D. and
              Bedrikovetsky, P.},
     TITLE = {Permeability hysteresis in gravity counterflow segregation},
   JOURNAL = {SIAM J. Appl. Math.},
  FJOURNAL = {SIAM Journal on Applied Mathematics},
    VOLUME = {66},
      YEAR = {2006},
    NUMBER = {5},
     PAGES = {1512--1532 (electronic)},
      ISSN = {0036-1399},
   MRCLASS = {76S05 (35L65 76M20 76T10)},
  MRNUMBER = {2246067 (2007c:76075)},
       DOI = {10.1137/040616061},
       URL = {http://dx.doi.org/10.1137/040616061},
}