V.M. Gun’ko, A.K. Matkovsky, B. Charmas, J. Skubiszewska-Zięba, S. Pasieczna-Patkowska, Carbon-silica gel adsorbents: effects of matrix structure and carbon content on adsorption of polar and nonpolar adsorbates, Journal of Thermal Analysis and Calorimetry, 128(3) (2017) 1683–1697