Comparative characteristics of the qualitative state of humus compounds of virgin and cultivated soils by desorption mass spectrometry method von B. B. Paljanitsa, M. F. Berezhnjak, O. L. Tonkha, K. Laslo, A. Menikhard, A. Tot, O. A. Dudik, T. V. Chernjavskaja, T. V. Kulik

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