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- The effectiveness of rowing boat setting using the Empower Oarlock system / Martin Škopek, Jan Kresta, Josef Heidler, Jakub Tkáč . Journal of outdoor activities.Vol. 14, (2020), no 1-2, strana 26-34.
- Orienteering in lockdown condition - tools for training support / Lenka Vojtíková, Jan Hnízdil, Josef Heidler, Martin Škopek . Journal of outdoor activities.