00418naa a2200157 a 450000100080000000500110000800800410001910000190006024500650007926000090014465300080015365300130016170000160017470000220019077300480021216100461995-06-27 1988 bl uuuu u00u1 u #d1 aDREYFUS, B. L. aFuture directions for biological nitrogen fixation research. c1988 aFBN aRevisão1 aDIEM, H. G.1 aDOMMERGUES, Y. R. tPlant Soilgv. 108, n. 1, p. 191-199, 1988.