@article{AlvarezGrima1999FuzzyModelPrediction, author = "M. Alvarez Grima and R. Babu\v{s}ka", title = "Fuzzy model for the prediction of unconfined compressive strength of rock samples", journal = "International Journal of Rock Mechanics and Mining Sciences", volume = 36, number = 3, pages = "339--349", year = 1999 }