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Saito, Y., G. Kokubugata, K. Kondo, I. V. Tatarenko & P. V. Kulikov. 2005. Distribution patterns of 45S ribosomal DNA sites on somatic chromosomes of three subspecies of Inula britannica (Asteraceae) in Japan and Russia. Ann. Tsukuba Bot. Gard. 24: 63–69.