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Schäfer, Daniela; Gjerdalen, G. F.; Solberg, Erik Ekker; Khokhlova, Maria; Badtieva, Vikoriya; Herzig, David; Trachsel, Lukas; Noack, Patrick; Karavirta, Laura; Eser, Prisca; Saner, Hugo Ernst; Wilhelm, Matthias (2015). Sex differences in heart rate variability: a longitudinal study in international elite cross-country skiers. European journal of applied physiology, 115(10), pp. 2107-2114. Springer 10.1007/s00421-015-3190-0
