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Krak K., Fehrer J. & Chrtek J. 2006: Molecular tools for inferring phylogeny in Hieracium. Vreš B. & Babij V. (eds.), 9th International Hieracium Workshop, Trenta (Julian Alps), Slovenia, 6 - 11 September, 2006. Abstracts of lectures and posters. - Jovan Hadþi Institute of Biology, Scientific Research Centre SASA, Ljubljana, ISBN 961-6568-61-2, 9 - 10.
Peckert T. & Chrtek J. 2006: Mating interactions between coexisting diploid, triploid and tetraploid cytotypes of Hieracium echioides (Asteraceae). Folia Geobotanica 41, 323 - 334.
Chrtek J. & Plačková I. 2005: Genetic variation in Hieracium alpinum (Asteraceae) in the Krkonoše Mts (West Sudeten Mts, Czech Republic). Biologia 60, 387 - 391.
Mandák B., Bímová K., Plačková I., Mahelka V. & Chrtek J. 2005: Loss of genetic variation in geographically marginal populations of Atriplex tatarica (Chenopodiaceae). Annals of Botany 96, 901 - 912.
Mráz P., Chrtek J. jun., Fehrer J. & Plačková I. 2005: Rare recent natural hybridization in Hieracium s.str. – evidence from morphology, allozymes and chloroplast DNA. 255, 177 - 192.
Peckert T., Chrtek J. & Plačková I. 2005: Genetic variation in agamospermous populations of Hieracium echioides in southern Slovakia and northern Hungary (Danube Basin). Preslia 77, 307 - 315.
Chrtek J. jun. 2004: Jestřábníky podrodu Hieracium v Krkonoších. (Hieracium subgen. Hieracium in the Giant Mountains.) Štursa J., Mazurski K.R., Palucki A. & Potocka J. (eds.): Geoekologické problémy Krkonoš, Opera Corcontica 41, 142 - 147.
Chrtek J. jun., Mráz P. & Severa M. 2004: Chromosome numbers in selected species of Hieracium s.str. (Hieracium subgen. Hieracium. Preslia 76, 119 - 139.
Krahulec F., Krahulcová A., Fehrer J., Bräutigam S., Plačková I. & Chrtek J. jun. 2004: The Sudetic group of Hieracium subgen. Pilosella from the Krkonoše Mts: A synthetic view. Preslia 76, 223 - 243.
2002: Mandák B. & Pyšek P. (2002): Reynoutria, křídlatka. – In: Kubát K., Hrouda L., Chrtek J. jun., Kaplan Z., Kirschner J. & Štěpánek J. (eds.), Klíč ke květeně České republiky, p. 201–202, Academia, Praha..
2002: Mandák B. (2002): Atriplex, lebeda. – In: Kubát K., Hrouda L., Chrtek J. jun., Kaplan Z., Kirschner J. & Štěpánek J. (eds.), Klíč ke květeně České republiky, p. 181–183, Academia, Praha..