Byzdra, Krzysztof, Kamil Więckowski, Mirosław Piątek, Janusz Mikołajczyk, and Robert Stępniak. 2017. “Changes in the Physical Capacity of Road Cyclists During the Preparatory Period”. Journal of Education, Health and Sport 7 (7):1175-94. https://apcz.umk.pl/JEHS/article/view/5147.