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- [1] INFRARED SPECTROSCOPIC EXAMINATION OF HUMIC ACIDS .3. ACTA PHYSICA ET CHEMICA, 1981, 27 (1-4): : 135 - 140
- [2] INFRARED SPECTROSCOPIC EXAMINATION OF HUMIC ACIDS, .2. ACTA PHYSICA ET CHEMICA, 1980, 26 (1-2): : 103 - 110
- [4] FLUORESCENCE SPECTROSCOPIC STUDIES ON HUMIC ACIDS ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE, 1977, 140 (05): : 563 - 570