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Saito, Y. & G. Kokubugata. 2004. Cytological comparison of 5S ribosomal DNA sites on somatic chromosomes in Aster @xsekimotoi and speculation of its parental species (Asteraceae). Chromosome Sci. 8: 103–107.
MATSUDA, T. 1970. On the accessory chromosomes of Aster I. The accessory chromosomes of Aster ageratoides grou-p-.~~ J. Sci. Hiroshima Univ., Ser. B, Div. 2, 13: 1-63.