4. Deniz, V. A new size distribution model by t-family curves for comminution of limestones in an impact crusher. Advanced Powder Technology. 2012. ,vol.22, p. 761-76510.1016/j.apt.2010.10.020
5. Dey, K.; Ghose A.K. Review of Cuttability Indices and A New Rockmass Classification Approach for Selection of Surface Miners. Rock Mechanics And Rock Engineering. 2011. vol.44 (5), p. 601-611.
8. Hood, M.; Gurgenci, H.; Hatherly, P. Underground mines of tomorrow. Seventh Ausimm Underground Operators' Conference. Australasian Institute Of Mining And Metallurgy Publication Series, 1998, vol. 98 (3), p 187.-191.
11. Karu, V.; Valgma, I.; Rahe, T. Mining Waste Reduction Methods. 13th International Symposium "Topical Problems in the Field of Electrical and Power Engineering", Doctoral Scholl of Energy and Geotechnology II, Pärnu, Estonia, 14-19.01.2013 (278 - 280). Tallinn: Elektrijam
13. Karu, V.; Västrik, A.; Valgma, I. Application of modelling tools in Estonian oil shale mining area . Oil Shale, 2008, vol. 25(2S), p.134 -144.10.3176/oil.2008.2S.05
15. Lohk, M.; Väli, E.; Tohver, T.; Pastarus, J.-R. Surface miner technology impact on the environment. In: 5th International Symposium "Topical problems in the field of electrical and power engineering". Tallinna Tehnikaülikool, 2008,p. 44 - 47.
18. Nikitin, O.; Väli, E.; Pastarus, J.; Sabanov, S. The Surface Miner Sustainable Oil-shale Mining Technology Testing Results in Estonia. Proceedings of the Sixteenth International Symposium on Mine Planning and Equipment Selection and the Tenth International Symposium on Environmental Issues and Waste Management in Energy and Mineral Production: Mine Planning and Equipment Selection and Environmental Issues and Waste Management in Energy and Mineral Production. Bangkok, Thailand, December 11-13, 2007. p.678.10.17770/etr2007vol1.1735
19. Nikolov, S. A performance model for impact crushers. Minerals Engineering, 2002.vol.15(10), p.715.-721. of Tallinn University of Technology, Tallinn, pp 11310.1016/S0892-6875(02)00174-7
20. Orru, M.; Väizene, V.; Pastarus, J.-R.; Sõstra, Y.; Valgma, I. Possibilities of oil shale mining under the Selisoo mire of the Estonia oil shale deposit. Environmental Earth Sciences, 2013, p.1-11. DOI 10.1007/s12665-013-2396-x10.1007/s12665-013-2396-x
21. Otsmaa, M.; Soosalu, H.; Valgma, I. Detection of Mine Collapses with Seismic Methods in the Estonian Oil Shale Mining Area. 12th International Symposium "Topical Problems in the Field of Electrical and Power Engineering", Kuressaare, Estonia, 2012, p.171 - 172.
25. Soosalu, H.; Valgma, I. Detection of mine collapses with seismic methods- a case study from Estonia. Resource Reproducing, Lowwasted and Environmentally Protecting Technologies of Development of the Earth Interior, p.1.
28. Valgma, I. An evaluation of technological overburden thickness limit of oil shale open casts by using draglines. Oil Shale,1998., vol. 15(2), p. 134 - 146.10.3176/oil.1998.2S.04
29. Valgma, I. Post-stripping processes and the landscape of mined areas in Estonian oil shale open casts. Oil Shale 2000, vol. 17(2), p. 201 - 212.10.3176/oil.2000.2.10
33. Valgma, I. Dependence of the mining advance rate on the mining technologies and their usage criteria. Valgma, I. (Toim.). Resource Reproducing, Low-wasted and Environmentally Protecting Technologies of Development of the Earth Interior (2 pp.), 2009. Tallinn: Department of Mining TUT; Russian University of People Friendship
35. Valgma, I.; Karu, V.; Viil, A.; Lohk, M. Oil shale mining developments in Estonia as the bases for sustainable power industry. In: 4th International Symposium "Topical Problems in the Field of Electrical and Power Engineering" : Doctoral School of Energy and Geotechnology: 4th International Symposium "Topical Problems in the Field of Electrical and Power Engineering", Kuressaare, Estonia, 15.- .20.01.2007. (Toim.) Lahtmets, R.. Tallinn: Tallinn University of Technology, Faculty of Power Engineering, 2007, p.96 - 103.
36. Valgma, I.; Kattel, T. Low depth mining in Estonian oil shale deposit- Abbau von Ölschiefer in Estland. In: Kolloquium Schacht, Strecke und Tunnel 2005 : 14. und 15. April 2005, Freiberg/Sachsen: Kolloquium Schacht, Strecke und Tunnel 2005 : 14. und 15. April 2005, Freiberg/Sachsen. Freiberg: TU Bergakademie, 2005, p.213 - 223.
37. Valgma, I.; Leiaru, M.; Karu, V.; Iskül, R.. Sustainable mining conditions in Estonia. 11th International Symposium "Topical Problems in the Field of Electrical and Power Engineering", Doctoral Scholl of Energy and Geotechnology, Pärnu, Estonia, 16-21.01.2012 p.229 - 238).
38. Valgma, I.; Reinsalu, E.; Sabanov, S.; Karu, V. . Quality control of Oil Shale production in Estonian mines. Oil Shale,2010, vol. 27(3), p. 239 - 249.10.3176/oil.2010.3.05
39. Valgma, I.; Torn, H.; Erg, K. The impact of infiltration dam on the groundwater regime in the Kurtna landscape reserve area. Oil Shale, 2006, vol. 23(1), p. 3 - 14.10.3176/oil.2006.1.02
40. Valgma, I.; Västrik, A.; Kõpp, V. Sustainable mining technologies for Estonian minerals industry. Lahtmets, R (Toim.). 9th International Symposium Pärnu 2010 “Topical Problems in the Field of Electrical and Power Engineering” and “Doctoral School of Energy and Geotechnology II”, Pärnu, Estonia, June 14 - 19, 2010, p.69 - 73.
41. Valgma, I.. Sustainable phosphate rock mining. Proceedings of the Estonian Academy of Sciences. Engineering,2010, vol. 3(1), p.13 - 22.10.3176/eng.1997.1.02
45. Zhao, L.M.; Chen, L.J.; Zhang, D.B.; Li, Y. Modelling and Simulation of Particle Breakage in Jaw Crushers. Editor(s): Zhao, H. Mechanical And Electronics Engineering Iii, PTS 1-5. Applied Mechanics and Materials. Vol.130-134, 2012 p.1148-1151. 10.4028/www.scientific.net/AMM.130-134.1148