X-ray Microradiographic Determination of Diffusion Coefficients within Porous Media Based on Fick's 2nd Law: Theory and Error Analysis Stephanie E. R. Dowker, Paul Anderson and James C. ElliottMicrosc. Microanal. Microstruct., 7 1 (1996) 49-63DOI: https://doi.org/10.1051/mmm:1996102