K. J. F. Lievens, V. Meynen, P. Cool, E. F. Vansant, G. V. Baron, and J. F. M. Denayer, “The release properties of the mesoporous materials SBA-15 and PHTS for their use in the controlled release of ibuprofen and vancomycin”, diffusion, vol. 2, Sep. 2005.