1. Analytica Chimica Acta. Volume 524, Issues 1-2, 25 October 2004, Pages 97-107
New trends involving the use of ultrasound energy for the extraction of humic substances from marine sediments
Antonio Moreda-Piñeiro, Adela Bermejo-Barrera and Pilar Bermejo-Barrera
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http://dx.doi.org/10.1016/j.aca.2004.03.096
Spectroscopic characterization of fulvic acids extracted from the rock exudate Shilajit
Rajesh Khanna, Matthias Witt, Md. Khalid Anwer, Suraj P. Agarwal and Boris P. Koch
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http://dx.doi.org/10.1016/j.orggeochem.2008.08.009
Corrigendum to “A comparison of lignin oxidation, enzymatic activity and fungal growth during white-rot decay of wheat straw” [Org. Geochem. 39 (2008) 945–951] Steven A. Robertson, Sharon L. Mason, Ethan Hack and Geoffrey D. Abbott
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http://dx.doi.org/10.1016/j.orggeochem.2008.03.022