Conference 70 years of Botanical Garden of Pavol Jozef Šafárik University, Slovakia, the history and the present of the botanical research and nature conservation. Košice : Univerzita Pavla Jozefa Šafárika, 2020. 42 s. Available on Internet: <https://unibook.upjs.sk/sk> <https://doi.org/10.33542/BOA2020-879-8> ISBN 978-80-8152-878-1.