Niskanen, Raina, and Väinö Mäntylahti. 1988. “Determination of Soil Specific Surface Area by Water Vapor Adsorption: III Comparison of Surface Areas Determined by Water Vapor and Nitrogen Gas Adsorption ”. Agricultural and Food Science 60 (2):73-79. https://doi.org/10.23986/afsci.72277.