Kolář, F., Lučanová, M., Koutecký, P., Dortová, M., Knotek, A., Suda, J. Spatio-ecological segregation of diploid and tetraploid cytotypes of Galium valdepilosum (Rubiaceae) in Central Europe. Preslia. 2014, 86(2), 155-178. ISSN 0032-7786. E-ISSN 0032-7786.