• Prospects for application of waste rock aggregates as filling material in Estonian underground minesPastarus, Jüri-Rivaldo; Sõstra, Ülo; Valgma, Ingo; Väizene, Vivika; Väli, Erik; Tohver, Tarmo; Šommet, JulijaInternational oil shale symposium : Tallinn, Estonia, June 10-13, 20132013 / p. 35-36 https://kirjandus.geoloogia.info/reference/34089