Brezigar, Aleksander, Bojan Ogorelec, Lija Rijavec, and Pero Mioč. 1987. “Geologic Setting of the Pre-Pliocene Basis of the Velenje Depression and Its Surroundings”. Geologija 30 (1):31-65. https://www.geologija-revija.si/index.php/geologija/article/view/583.