Niskanen, R., and V. Mäntylahti. “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, vol. 60, no. 2, Mar. 1988, pp. 73-79, doi:10.23986/afsci.72277.