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Halabe, V., Liu, S., Salazar, G.F., and Einstein, H.H. (1994). SIMSECTION: Knowledge based user interface for tunneling. In: Proceedings of the 8th International Conference on Computer Methods and Advances in Geomechanics (H.J. Siriwardane, M.M. Zaman, eds.), vol.1, Morganton, West Virginia, USA, 22-28 May 1994, pp. 429-435. Balkema, Rotterdam, 1994. ISBN 9054103809