Application of modelling tools in Estonian oil shale mining areaKaru, Veiko; Västrik, Aire; Valgma, IngoOil shale2008 / 2S, p. 135-144 : ill https://www.researchgate.net/publication/220009284_APPLICATION_OF_MODELLING_TOOLS_IN_ESTONIAN_OIL_SHALE_MINING_AREA