%0 Journal Article %T PAMPA--a drug absorption in vitro model 8. Apparent filter porosity and the unstirred water layer. %A Nielsen, Per E %A Avdeef, Alex %J European Journal of Pharmaceutical Sciences %V 22 %N 1 %P 33-41 %@ 0928-0987 %D 2004-10-05 %~ DeepDyve