1. Northern Sea Route
:KOPER, Ján - KOVÁČIK, Branislav - KUCHARČÍK, Rudolf. Northern Sea Route : Geopolitical Importance. - Registrovaný: Scopus. In The Handbook of the Arctic : A Broad and Comprehensive Overview. - Singapore : Springer Nature Singapore, 2022. ISBN 978-981-16-9249-9, pp. [1-14].