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- [2] THE IMPORTANCE OF NITROGEN-FIXATION OF BLUE-GREEN-ALGAE AND THE AZOLLA-ANABAENA SYMBIOSIS FOR THE CULTIVATION OF LOWLAND RICE TROPENLANDWIRT, 1986, 87 : 11 - 18
- [8] The presence of the symbiont in the Azolla-Anabaena symbiosis is essential for the ability of the fern to utilize combined nitrogen BIOLOGICAL NITROGEN FIXATION, SUSTAINABLE AGRICULTURE AND THE ENVIRONMENT, 2005, 41 : 326 - 326