[Baran, A. (2002) Characterization of Carex peat using extinction values of humic acids. Bioresource Technol., 85, 99-101.]Search in Google Scholar
[Cavani, L., Ciavatta, C., Gessa, C. (2003) Identification of organic matter from peat, leonardite and lignite fertilisers using humification parameters and electrofocussing. Bioresource Technol., 86, 45-52.]Search in Google Scholar
[Chaplin, M. F., Kennedy, J. F. (1994) Carbohydrate Analysis: a Practical Approach. London: Oxford University Press, pp. 32-33.]Search in Google Scholar
[Chen, Y., Senesi, N., Schnitzer, M. (1977) Information provided on humic substances by E4/E6 ratios. Soil Sci. Soc. Amer. J., 41(2), 352-358.10.2136/sssaj1977.03615995004100020037x]Search in Google Scholar
[Corvasce, M., Zsolnay, A., D'Orazio, V., Lopez, R., Miano, T. M. (2006) Characterization of water-extractable organic matter in a deep soil profile. Chemosphere, 62, 1583-1590.10.1016/j.chemosphere.2005.07.065]Search in Google Scholar
[Domeizel, M., Khalil, A., Prudent, P. (2004) UV spectroscopy: a tool for monitoring humification and for proposing an index of the maturity of compost. Bioresource Technol., 94, 177-184.]Search in Google Scholar
[Francioso, O., Ciavatta, C., Montecchio, D., Tugnoli, V., Sanchez-Cortes, S., Gessa, C. (2003) Quantitative estimation of peat, brown coal and lignite humic acids using chemical parameters, 1H-NMR and DTA analyses. Bioresource Technol., 88, 189-195.]Search in Google Scholar
[Fuchsman, C. H. (1980) Peat: Industrial Chemistry and Technology. Academic Press: N. Y. 279 pp.]Search in Google Scholar
[Hargitai, L. (1994) Biochemical transformation of humic substances during humification related to their environmental functions. Environ. Internat., 20(1), 43-48.10.1016/0160-4120(94)90065-5]Search in Google Scholar
[Ikeya, K., Watanabe, A. (2003) Direct expression of an index for the degree of humification of humic acids using organic carbon concentration. Soil Sci. Plant Nutr., 49(1), 47-53.10.1080/00380768.2003.10409978]Search in Google Scholar
[Jerzykiewicz, M., Drozd, J., Jezierski, A. (1999) Organic radicals and paramagnetic metal complexes in municipal solid waste composts. An EPR and chemical study. Chemosphere, 39(2), 253-268.]Search in Google Scholar
[Lu, X. Q., Hanna, J. V., Johnson, W. D. (2001) Evidence of chemical pathways of humification: a study of aquatic humic substances heated at various temperatures. Chem. Geol., 177, 249-264.10.1016/S0009-2541(00)00412-5]Search in Google Scholar
[Lu, X. Q., Hanna, J. V., Johnson, W. D., 2000. Source indicators of humic substances: An elemental composition, solid state 13C NMR and Py-GC-MS study. Appl. Geochem., 15, 1019-1033.10.1016/S0883-2927(99)00103-1]Search in Google Scholar
[Lukoshko, E. S., Bambalov, N. N., Khoruznik, A. V., Striguikii, V. P., Dudarchik, V. M. (1988) Composition and properties of the humic acids of the initial period of peat formation. Khim. Tverdogo Topliva, 22(5), 3-10.]Search in Google Scholar
[Milori, D. M. B. P., Neto, L. M., Bayer, C., Mielniczuk, J., Bagnato, V. S. (2002) Humification degree of soil humic acids determined by fluorescence spectroscopy. Soil Sci., 167(11), 739-749.10.1097/00010694-200211000-00004]Search in Google Scholar
[Perez, M. G., Martin-Neto, L., Saab, S. C., Novotny, E. H., Milori, D. M. B. P., Bagnato, V. S., Colnago, L. A., Melo, W. J., Knicker, H. (2004) Characterization of humic acids from a Brazilian oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy. Geoderma, 118, 181-190.10.1016/S0016-7061(03)00192-7]Search in Google Scholar
[Piccolo, A. (2001) The supramolecular structure of humic substances. Soil Sci., 166(11), 810-832.10.1097/00010694-200111000-00007]Search in Google Scholar
[Preston, C. M., Axelson, D. E., Levesque, M., Mathur, S. P., Dinel, H., Dudley, R. L. (1989) Carbon 13 NMR and chemical characterization of particle size separates of peats differing in degree of decomposition. Org. Geochem., 14(4), 393-403.10.1016/0146-6380(89)90005-3]Search in Google Scholar
[Rosa, A. H., Simoes, M. L., de Oliveira, L. C., Rocha, J. C., Neto, L. M., Milori, D. M. B. P. (2005) Multimethod study of the degree of humification of humic substances extracted from different tropical soil profiles in Brazil's Amazonian region. Geoderma, 127, 1-10.10.1016/j.geoderma.2004.10.009]Search in Google Scholar
[Schimel, D. S., Braswell, B. H., Parton, W. J. (1997) Equilibration of the terrestrial water, nitrogen and carbon cycles. Proc. Natl. Acad. Sci. USA, 94(16), 8280-8283.10.1073/pnas.94.16.8280]Search in Google Scholar
[Schnitzer, M., Levesque, M. (1979) Electron spin resonance as a guide to the degree of humification of peats. Soil Sci., 127(3), 140-145.10.1097/00010694-197903000-00003]Search in Google Scholar
[Steelink, C. (1985) Implications of elemental characteristics of humic substances. In Aiken, G. R., McKnight, D. M., Wershow, R. L., MacCarthy, P. (eds.). Humic Substances in Soil, Sediment, and Water (pp. 457-476). New York: Wiley.]Search in Google Scholar
[Stevenson, F. J. (1994) Humus Chemistry: Genesis, Composition, Reactions. 2nd ed. New York: Wiley. 496 pp.]Search in Google Scholar
[Tan, K. H. (2005) Soil Sampling, Preparation, and Analysis. 2nd ed. New York: Taylor & Francis group. 623 pp.10.1201/9781482274769]Search in Google Scholar
[Van Krevelen, D. W. (1950) Graphical statistical method for the study of structure and reaction processes of coal. Fuel, 29, 269-284.]Search in Google Scholar
[Von Post, L. (1924) Das genetische System der Organogenen Bildungen Schwedens. In Memoires sur la nomenclature et la classification des sols. International Committee of Soil Science, Helsinki, pp. 287-304.]Search in Google Scholar
[Zsolnay, A., Baigar, E., Jimenez, M., Steinweg, B., Saccomandi, F. (1999) Differentiating with fluorescence spectroscopy the sources of dissolved organic matter in soils subjected to drying. Chemosphere, 38(1), 45-50.10.1016/S0045-6535(98)00166-0]Search in Google Scholar
[Лиштван, И.И., Король, Н.Т. (1975) Основные свойства торфа и метοдыих определения [Basic properties of Peat and Methods for Their Determination]. Минск: Наука и техника. 320 с. (in Russian).]Search in Google Scholar