References

1. Albert, A. and J. A. Anderson. 1984. "On the Existence of Maximum Likelihood Estimates in Logistic Regression Models." Biometrika, 71:1-10.
   
   
2. Eckart, Carl and Gale Young. 1936. "The Approximation of One Matrix By Another of Lower Rank." Psychometrika, 1: 211-218.
   
   
3. Poole, Keith T. 2000. "Non-Parametric Unfolding of Binary Choice Data." Political Analysis, 8(3):211-237.
   
   
4. Poole, Keith T. 2002.Spatial Models of Legislative Voting. Chapter 1: Introduction
   
   
5. Poole, Keith T. 2002.Spatial Models of Legislative Voting. Chapter 2: The Geometry of Legislative Roll Call Voting
   
   
6. Poole, Keith T. 2003.Spatial Models of Legislative Voting. Chapter 3: The Optimal Classification Method
   
   
7. Poole, Keith T. 2003.Spatial Models of Legislative Voting. Technical Supplement to Chapter 3: The Optimal Classification Method
   
   
8. Silvapulle, Mervyn J. 1981. "On the Existence of Maximum Likelihood Estimators for the Binomial Response Models." Journal of the Royal Statistical Society Series B, 43(3):310-313.