MIDRIAK, Rudolf et al. The landscape diversity and its protection in the eastern part of the East Carpathians Biosphere Reserve : (case study from the catchment area of the Zboj creek). Rec. Ivan Vološčuk, Ján Terray. 1. vyd. Zvolen : Technická univerzita vo Zvolene, 1998. 55 s. Vedecké štúdie, 11/1997/A. ISBN 80-228-0692-7.