Daniel Varecha, Slavomir Hrcek, Otakar Bokuvka, Frantisek Novy, Libor Trsko, Ruzica Nikolic, and Michal Jambor. “Fatigue Safety Coefficients for Ultra – High Region of Load Cycles”. Communications - Scientific Letters of the University of Zilina, Vol. 22, no. 4, Oct. 2020, pp. 97-102, doi:10.26552/com.C.2020.4.97-102.