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3. Bodenmüdigkeit, ihre Ursache und Bekämpfung;Bronsart,1931
4. The possible role of bacteria in relation to the replant disease;Bunt;Meded. Fac. Landbouwwet. Rijksuniv. Gent.,1973
5. Rhizosphere micro-organisms in relation to the apple replant problem;Catska;Plant and Soil,1982