• Blasting of overburden rock in Estonian oil shale open casts - a multidiciplinary study using seismology and mining engineeringSoosalu, Heidi Elisabet; Ring, Merike; Noška, Margus; Iskül, Riho; Valgma, IngoInternational oil shale symposium : Tallinn, Estonia, June 10-13, 20132013 / p. 60 https://kirjandus.geoloogia.info/en/reference/24710