1. Basel Committee on Banking Supervision 2005 Validation of Low-Default Portfolios in the Basel II Framework Basel Committee Newsletter no. 6
2. Benjamin , N. A. Cathcart K. Ryan 2006 Low Default Portfolios: A Proposal for Conservative Estimation of Default Probabilities
3. SMOTE: Synthetic Minority Over-Sampling Technique;Chawla;Journal of Artificial Intelligence Research,2002
4. Clifford , T. A. Marianski K. Sebestyen 2013 Low Default Portfolio Modeling-Probability of Default-Calibration Conundrum