Woessner, J., A. Christophersen, J. D. Zechar, and D. Monelli. “Building Self-Consistent, Short-Term Earthquake Probability (STEP) Models: Improved Strategies and Calibration Procedures”. Annals of Geophysics, vol. 53, no. 3, Nov. 2010, pp. 141-54, doi:10.4401/ag-4812.