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The authors wish to thank the BNSF (Israel-USA Binational Science Foundation) Contract No. 3123/82 and the Ministry of Education, Science and Culture, Japan (Grant. No. 56470034) for financial support.
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Ikan, R., Ioselis, P., Rubinsztain, Y. et al. Carbohydrate origin of humic substances. Naturwissenschaften 73, 150–151 (1986). https://doi.org/10.1007/BF00367403
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DOI: https://doi.org/10.1007/BF00367403