New method for the determination of adsorption space volume for sorbents with an arbitrary porous structure from excess gas adsorption isotherm measurements Yakubov, T.S.; Shekhovtsova, L.G.; Pribylov, A.A. Russian Chemical Bulletin 44(12): 2277-2281 1995 1066-5285 10.1007/bf00713593 https://eurekamag.com/research/062/471/062471265.php