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- [41] PIEZOELECTRICAL METHOD FOR THE DETERMINATION OF ISOTHERM OF POROUS MATERIAL ADSORPTION UNDER HIGH-PRESSURES IN THE WIDE TEMPERATURE-RANGE .3. ISOTHERMS OF HELIUM AND N2(2,8-PERCENT-BY-VOLUME)-HELIUM MIXTURE ADSORPTION AT ACTIVE CARBONS ZHURNAL FIZICHESKOI KHIMII, 1989, 63 (09): : 2509 - 2510