15.
Sing, K.S.W.; Everett, D.H.; Haul, R.A.W.; Moscou, L.; Pierotti, R.A.; Rouquérol, J.; Siemieniewska, T.; Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity; Pure&Appl. Chem.; vol. 57, no. 4, 1985, pp. 603-619.