Snow an ecological phenomenon : conference took place in Smolenice from Monday 18th Sepetember to Thursday 21st September 2017 / editors Bernard Šiška, Pavol Nejedlík, Mariana Eliašová . Nitra :  Garmond , 2017 . 1 USB kľúč (cca 87 s) . ISBN 978-80-89703-47-0 . [1, of that borrowed 0]