1. Aryavand A (1975) Contribution à l’étude cytotaxonomique de quelques angiospermes de l’Iran. Bot Not 128:299–311
2. Aryavand A (1976) IOPB chromosome number reports LII. Taxon 25:341–346
3. Duistermaat H (1996) Monograph of Arctium L. (Asteraceae). Generic delimitation (including Cousinia Cass. p. p.), revision of the species, pollen morphology and hybrids. Gorteria 3:1–143
4. Fedorov AA (ed) (1969) Chromosome numbers of flowering plants. Akademiya Nauk, Leningrad
5. Fernández Casas FJ, Fernández Morales MJ (1979) Centaurea lainzii, untriploide natural. Mém Soc Bot Genève 1:115–122