Influence of water discharging on water balance and quality in the Toolse river in Ubja oil shale mining regionRobam, Karin; Valgma, Ingo; Iskül, RihoOil shale2011 / 3, p. 447-463 : ill https://artiklid.elnet.ee/record=b2427696*est The origin and amount of removal water in the Ubja oil shale opencast mine and its influence to the Toolse riverIskül, Riho; Kaeval, Ervin; Robam, Karin; Sõstra, Ülo; Valgma, IngoInternational Oil Shale Symposium : Tallinn, Estonia, June 8-11, 2009 : future energy solutions : come and share your vision!2009 / p. 83 http://www.ester.ee/record=b4775098*est Ubja põlevkivikarjääri ärastusvee päritolu ja koguse määramineIskül, Riho; Kaeval, Ervin; Robam, Karin; Sõstra, Ülo; Valgma, IngoKeskkonnatehnika2009 / 3, lk. 34-36 : ill