@article{Ritto_2012 author = {Thiago G. Ritto and R. Sampaio}, title = {STOCHASTIC DRILL-STRING DYNAMICS WITH UNCERTAINTY ON THE IMPOSED SPEED AND ON THE BIT-ROCK PARAMETERS }, journal = {International Journal for Uncertainty Quantification}, issn = {2152-5080}, year = {2012}, volume = {2}, number = {2}, pages = {111--124} }