N. Krasņevska, D. Grauda, D. Kļaviņa, and I. Rashal, “ENDOPOLYPLOIDY OF ENDANGERED PLANT SPECIES LIGULARIA SIBIRICA IN DIFFERENT ENVIRONMENTS”, ETR, vol. 1, pp. 161–164, Jun. 2017, doi: 10.17770/etr2017vol1.2551.