Azotobacter: Diferenzas entre revisións
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|title= Isolation of Azotobacter Insignis From Fresh Water
|journal = Ecology|year = 1967|volume = 48
|issue = 4|pages = 671–672|jstor=1936516}}</ref> e
|author = Dicker H. J., Smith D. W.|title= Enumeration and Relative Importance of Acetylene-Reducing (Nitrogen-Fixing) Bacteria in a Delaware Salt Marsh
|pmc=291468
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