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- [3] FRACTIONAL PRECIPITATION OF HUMIC-ACID FROM COLORED NATURAL-WATERS WATER AIR AND SOIL POLLUTION, 1989, 46 (1-4): : 187 - 198
- [8] FUNDAMENTAL-STUDIES ON THE COPRECIPITATION OF NANOGRAM QUANTITIES OF SOME METALS WITH THE DIMETHYLGLYOXIME/NI/1-(2-PYRIDYLAZO)-2-NAPHTHOL COMPLEX AND THEIR DIRECT DETERMINATION BY ATOMIC-ABSORPTION SPECTROMETRY USING AN INNER MINIATURE CUP FOR THE SOLID SAMPLING TECHNIQUE - APPLICATION TO NATURAL-WATERS FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1988, 329 (07): : 750 - 755