00371nam a2200145Ia 4500008004100000020001500041082001800056100002000074245003100094260003400125300000800159650001800167650001800185653002200203170901s1981    xx            000 0 und d  a0198545401  a574.133bB88N  aBroughton, W.J. 0aNitrogen FixationbEcology  aOxfordbClarendon Pressc1981  a306  aLife sciences  aPure Sciences  aNitrogen fixation