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	1.	Use of heterotrophic and cyanobacterial nitrogen fixation to study the impact of anthropogenic substances on soil biological processes. [electronic resource] by Mårtensson, A M Producer: 19930309 In: Bulletin of environmental contamination and toxicology vol. 50 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Nitrogen Fixation in an Establishing Alfalfa (Medicago sativa L.) Ley in Sweden, Estimated by Three Different Methods. [electronic resource] by Mårtensson, A M Ljunggren, H D Producer: 20100625 In: Applied and environmental microbiology vol. 48 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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