SORPTION OF FLUORIDE BY HYDROUS ALUMINIUM OXIDEHELMY AK; PEINEMANN N.1979; Z. PHYS. CHEM., LEIPZIG; DDR; DA. 1979; VOL. 260; NO 1; PP. 65-71; BIBL. 15 REF.Article

FLOCULATION OF NH₄-MONTMORILLONITE BY ELECTROLYTESHELMY AK; FERREIRO EA.1974; J. ELECTROANAL. CHEM. INTERFACIAL ELECTROCHEM.; NETHERL.; DA. 1974; VOL. 57; NO 1; PP. 103-112; BIBL. 22 REF.Article

DONNAN EMF MEASUREMENTS IN SUSPENSIONSPEINEMANN N; HELMY AK.1973; SOIL SCI.; U.S.A. ; 1973, VOL. 115, NUM. 0005, P. 331 A 335Serial Issue

POSITIVE AND NEGATIVE ROOT MEMBRANE POTENTIALS.FERREIRO EA; HELMY AK.1976; AN. EDAFOL. AGROBIOL.; ESP.; DA. 1976; VOL. 35; NO 1-2; PP. 95-101; ABS. ESP.; BIBL. 14 REF.Article

DONNAN EMF MEASUREMENTS IN SUSPENSIONSPEINEMANN N; HELMY AK.1973; SOIL SCI.; U.S.A. ; 1973, VOL. 115, NUM. 0005, P. 331 A 335Serial Issue

THE POINT OF ZERO CHARGE OF HYDROUS ALUMINIUM OXIDE.FERREIRO EA; HELMY AK.1976; Z. PFLANZENERNAEHR. BODENKDE; DTSCH.; DA. 1976; NO 6; PP. 757-766; ABS. ALLEM.; BIBL. 1 P.Article

THE ALUMINIUM OXIDE-AQUEOUS INTERFACE AND THE POINT OF ZERO CHARGE.HELMY AK; FERREIRO EA.1975; Z. PHYS. CHEM., LEIPZIG; DTSCH.; DA. 1975; VOL. 257; NO 5; PP. 881-892; BIBL. 12 REF.Article

ELECTRIC POTENTIALS OF BI-ZONAL CLAY FILM MEMBRANESHELMY AK; NATALE IM; GRAZAN AM et al.1976; COLLOID POLYM. SCI.; GERM.; DA. 1976; VOL. 254; NO 1; PP. 50-54; ABS. ALLEM.; BIBL. 12 REF.Article

FLOCCULATION OF NA-MONTMORILLONITE BY ELECTROLYTES.FERREIRO EA; HELMY AK.1974; CLAY MINER.; GBR; 1974, VOL. 10, NUM. 0003, P. 203 A 213Serial Issue

THE APPARENT AND PARTIAL MOLAL VOLUMES OF K-MONTMORILLONITEFERREIRO EA; HELMY AK.1972; CLAY MINER.; G.B. ; 1972, VOL. 9, NUM. 0004, P. 361 A 368Serial Issue

EVALUATION OF THE CATION EXCHANGE CONSTANT.HELMY AK; PEINEMANN N.1971; GEODERMA; NLD; 1971(8), VOL. 6, NUM. 0001, P. 69 A 73Miscellaneous

PARTIAL MOLAL VOLUMES OF CALCIUM-MONTMORILLONITE.FERREIRO EA; HELMY AK.1971; CLAY MINER.; GBR; 1971, VOL. 9, NUM. 0002, P. 177 A 184Miscellaneous

SORPTION OF PHOSPHATE BY HYDROUS OXIDES OF ALUMINIUM AND IRON.PEINEMANN N; HELMY AK.1977; J. ELECTROANAL. CHEM. INTERFACIAL ELECTROCHEM.; NETHERL.; DA. 1977; VOL. 78; NO 2; PP. 325-330; BIBL. 14 REF.Article

THE ELECTRIC POTENTIAL MIDWAY BETWEEN OVERLAPPING CLAY FLAT DOUBLE LAYERS: A COMPILATION OF THEORETICAL TREATMENTS = LE POTENTIEL ELECTRIQUE DU MILIEU ENTRE DEUX COUCHES DOUBLES SE RECOUVRANT DANS UN MINERAL ARGILEUX: COMPILATION DES EVALUATIONS THEORIQUESHELMY AK; NATALE IM; ELPRINCE A et al.1982; Z. PFLANZENERNAEHR. BODENKD.; ISSN 0044-3263; DEU; DA. 1982; VOL. 145; NO 2; PP. 140-150; ABS. GER; BIBL. 18 REF.; ILL.Article

THE ELECTRIC POTENTIAL MIDWAY BETWEEN OVERLAPPING CLAYFLAT DOUBLE LAYERS: A COMPILATION OF THEORETICAL TREATMENTSHELMY AK; NATALE IM; ELPRINCE A et al.1982; Z. PFLANZENERNAEHR. BODENKD.; ISSN 0044-3263; DEU; DA. 1982; VOL. 145; NO 2; PP. 140-150; ABS. GER; BIBL. 18 REF.Article

ELECTRICAL POTENTIAL BETWEEN DISSIMILAR CLAY DOUBLE LAYERSHELMY AK; NATALE IM; MANDOLESI ME et al.1982; CLAYS CLAY MINER.; USA; DA. 1982; VOL. 30; NO 1; PP. 49-54; ABS. RUS/GER/FRE; BIBL. 21 REF.Article

NEGATIVE ADSORPTION IN CLAY-WATER SYSTEMS WITH INTERACTING DOUBLE LAYERS = ADSORPTION NEGATIVE DANS LES SYSTEMES ARGILE-EAU AVEC COUCHES DOUBLES INTERACTIVESHELMY AK; NATALE IM; MANDOLESI ME et al.1980; CLAYS CLAY MINER.; GBR; DA. 1980; VOL. 28; NO 4; PP. 262-266; ABS. RUS/GER/FRE; BIBL. 21 REF.; ILL.Article

EFFECT OF PH ON ROOT MEMBRANE POTENTIALS = EFFET DU PH SUR LES POTENTIELS DE MEMBRANE RADICULAIREHELMY AK; PEINEMANN N; FERREIRO EA et al.1974; PLANT AND SOIL; NETHERL.; DA. 1974; VOL. 40; NO 2; PP. 253-259; BIBL. 9REF.Article

EFFECT OF ROOT POSITION ON MEASURED ROOT MEMBRANE POTENTIALS = EFFET DE LA POSITION DES RACINES SUR LA MESURE DES POTENTIELS DES MEMBRANES DE RACINESHELMY AK; PEINEMANN N; FERREIRO EA et al.1973; J. EXP. BOT.; G.B.; DA. 1973; VOL. 24; NO 78; PP. 29-32; BIBL. 3 REF.Serial Issue

ADSORPTION OF 1,10-PHENANTHROLINE BY SOME CLAYS AND OXIDESDE BUSSETTI SG; FERREIRO EA; HELMY AK et al.1980; CLAYS CLAY MINER.; USA; DA. 1980; VOL. 28; NO 2; PP. 149-154; ABS. RUS/GER/FRE; BIBL. 15 REF.Article

CONCURRENT EFFECTS OF KCL AND PH ON ROOT CONCENTRATION POTENTIALS.HELMY AK; RON MM; FERREIRO EA et al.1977; Z. PFLANZENPHYSIOL.; DTSCH.; DA. 1977; VOL. 81; NO 3; PP. 269-277; BIBL. 8 REF.Article

ESTUDIO MINERALOGICO DE UNA MONTMORILLONITA DE CERRO BANDERA (PROVINCIA DEL NEUQUEN, REPUBLICA ARGENTINA = ETUDE MINERALOGIQUE D'UNE MONTMORILLONITE DE CERRO BANDERA, PROVINCE DE NEUQUEN, ARGENTINEPEINEMANN N; FERREIRO EA; HELMY AK et al.1972; REV. AS. GEOL. ARGENT.; ARGENT. ; 1972, VOL. 27, NUM. 0004, P. 399 A 405Serial Issue

ADSORPTION OF 1,10-PHENANTHROLINE BY SOME CLAYS AND OXIDESDE BUSSETTI SG; FERREIRO EA; HELMY AK et al.1980; CLAYS CLAY MINER.; GBR; DA. 1980; VOL. 28; NO 2; PP. 149-154; ABS. RUS/GER/FRE; BIBL. 15 REF.Article

PLANT ROOTS AS MULTI-ZONAL MEMBRANES = LES RACINES VEGETALES CONSIDEREES COMME DES MEMBRANES MULTIZONALESHELMY AK; FERREIRO EA; PEINEMANN N et al.1975; Z. PFLANZENPHYSIOL.; DTSCH.; DA. 1975; VOL. 76; NO 4; PP. 294-299; BIBL. 7 REF.Article

SORPTION OF 2,2'-BIPYRIDINE ON CLAYS AND OXIDESFERREIRO EA; DE BUSSETTI SG; HELMY AK et al.1983; ZEITSCHRIFT FUER PFLANZENERNAEHRUNG UND BODENKUNDE; ISSN 0044-3263; DEU; DA. 1983; VOL. 146; NO 3; PP. 369-378; ABS. GER; BIBL. 16 REF.Article