1. Afanasjeva, N. G. etMeškova, L. Z. (1961): Primenenije kario-geografičeskogo issledovanija k filogeniji rodaVeronica L.—Bot. Žurn., Moskva et Leningrad, 46: 247–259.
2. Andersson, H. (1958): Cytological and morphological observations in the genusRanunculus. I.—Bot. Notiser, Lund, 111: 237–240.
3. Arutiunova, A. G. (1940): Chromosome morphology in certain species of clover.—Compt. Rend. Acad. Sci. URSS, Ser. Nov., Moscou, 27: 825–827.
4. Ball, P. W. etHeywood, V. H. (1964): A revision of the genusPetrohagia.—Bull. Brit. Mus. (Nat. Hist.), Bot., London, 3/4.
5. Baksay, L. (1956): Cytotaxonomical studies on the flora of Hungary.—Annal. Hist. Natur. Mus. Nation. Hungar., Budapest, 7: 321–334.