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The major part of this work was carried out by the authors at the Institute for Soil Fertility, Groningen.
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Mulder, E.G., Bakema, K. & Van Veen, W.L. Molybdenum in symbiotic nitrogen fixation and in nitrate assimilation. Plant Soil 10, 319–334 (1959). https://doi.org/10.1007/BF01666208
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DOI: https://doi.org/10.1007/BF01666208