Choroszewicz, Paweł, Łukasz Brzezinski, Maksymilian Dybowski, Gracjan Różański, Anna Dobosiewicz, and Xawery Zukow. 2018. “Nutrition Practice During Ultramarathon Running in Theory and Reality”. Journal of Education, Health and Sport 8 (11):833-43. https://apcz.umk.pl/JEHS/article/view/7428.