%0 Journal Article %K Bulgaria %K classification %K cyber range %K Education %K functionalities %K training %K University %B Information & Security: An International Journal %D 2021 %N 2 %P 149-159 %R https://doi.org/10.11610/isij.5006 %T Implementation of Federated Cyber Ranges in Bulgarian Universities: Challenges, Requirements, and Opportunities %V 50