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Phaff, H. J.; Carmo-Sousa, L. (1962). "Four new species of yeast isolated from insect frass in bark of Tsuga heterophylla (Raf.) Sargent". Antonie van Leeuwenhoek. 28: 193–207. doi:10.1007/BF02538734. PMID13943102. S2CID26462843.
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Phaff, H. J.; Carmo-Sousa, L. (1962). "Four new species of yeast isolated from insect frass in bark of Tsuga heterophylla (Raf.) Sargent". Antonie van Leeuwenhoek. 28: 193–207. doi:10.1007/BF02538734. PMID13943102. S2CID26462843.