https://consevol.org/pdf/Vila_1997_Science_1.pdf,
https://researchportal.helsinki.fi/files/262015499/Heritability_of_the_elk_hunting_traits_in_the_Finnish_J_mthund_population.pdf,
https://austriaca.at/0xc1aa5572 0x003c3854.pdf,
https://pub.epsilon.slu.se/13471/7/arvelius_p_160629.pdf,
https://d-nb.info/961994371/34,
https://www.trainmaster.ch/XCV-15-Guide.pdf,