ŠIRKA, Pavel et al. Bryological research in Slovakia: history, status quo, challenges and perspectives. In Book of abstracts : conference 70 years of Botanical Garden of Pavol Jozef Šafárik University, Slovakia, Košice 3.-4. September 2020. - Košice : Pavol Jozef Šafárik University in Košice, 2020. ISBN 978-80-8152-878-1, p. 40. Dostupné na internete: <https://unibook.upjs.sk/img/cms/2020/bz/70-years-botanical-garden.pdf>