Gregg, S. J. Adsorption, surface area, and porosity, / by S. J. Gregg and K. S. W. Sing - U.S. ed. - London : Academic Press, 1967 - xi, 371 p. : ill. ; 24 cm. ISBN: 123009502 Subjects--Topical Terms: AdsorptionGases--Absorption and adsorption