Kristina Lindström, Zewdu Terefework, Leena Suominen, Gilles Lortet, Signalling and Development of Rhizobium: Legume Symbioses, Biology and Environment: Proceedings of the Royal Irish Academy, Vol. 102B, No. 1, Commentaries on Cyanobacterial Symbioses (Sep., 2002), pp. 61-64
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Lindström et al. (2002) studied this question.
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