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3. Mechanical transmission and properties of Abutilon mosaic virus;Costa;Phytopath.Z.,1960
4. Comparative studies between Abutilon and Euphorbia mosaic virus;Costa;Phytopath.Z.,1960
5. Observation on a mosaic disease of Leonorus sibircus occurring spontaneously in Sao Paolo;Flores;Phytopath.Z.,1961