1. Bermudez de Castro F, Canizo A, Costa A, Miguel C and Rodriguez-Barrueco C 1977 Cytokinins and nodulation of the non-legumesAlnus glutinosa andMyrica gale.In Recent Developments in Nitrogen Fixation. Eds. W Newton, J R Postgate and C Rodriguez-Barrueco. pp 539–550. Academic Press, London.
2. Capellano A, Dequatre B, Valla G and Moiroud A 1987 Root-nodules formation byPenicillium sp. onAlnus glutinosa andAlus incana. Plant and Soil 104, 45–51.
3. Dijk C van 1984 Ecological Aspects of Spore Formation in theFrankia-Alnus Symbiosis. PhD thesis, Univ. Leiden, The Netherlands.
4. Dijk C van and Sluimer-Stolk A 1984 An ineffective strain ofFrankia-Ag in the dune area of Voorne. Progr. Rep. Inst. Ecol. Res. Verh. Kon. Ned. Akad. Wetensch., 2e Reeks 82, 56–59.
5. Dijk C van and Sluimer-Stolk A An ineffective strain type ofFrankia in the soil of natural sands ofAlnus glutinosa (L.) Gaertn. Plant and Soil. (Submitted).