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_aAlexander, Martin. _93826 |
| 245 | _aEcological constraints on nitrogen fixation in agricultural ecosystems | ||
| 500 | _aSobretiro de : Advances Microbial Ecology 8:163-183, 1985 | ||
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_aNitrógeno _xFijación. _981472 |
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_aRhizobium. _997124 |
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