Nikishina, T. V., A. S. Popov, and E. A. Popovich. 2005. “Cryopreservation of Seeds of Dactylorhiza Baltica (Klinge) Orlova (Orchis Baltica (Klinge) Nevski) Rare Orchid of Temperate Latitudes”. Problems of Cryobiology and Cryomedicine 15 (3):280. https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/1104.