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Yang, J. ., Pitts, W. ., Fernandez, M. ., & Prasad, K. . (2011). Measurements of Effective Diffusion Coefficient of Helium and Hydrogen Through Gypsum. Presented at the. Retrieved from http://conference.ing.unipi.it/ichs2011/papers/144.pdf

Yang, J. C., Pitts, W. M., Fernandez, M. ., & Prasad, K. . (2013). Measurements of effective diffusion coefficients of helium and hydrogen through gypsum. International Journal of Hydrogen Energy, 38(19), 8125-8131+. https://doi.org/10.1016/j.ijhydene.2012.09.030 (Original work published)