1. Welch P. , Weak systems of determinacy and arithmetical quasi-inductive definitions, a preprint.
2. Tanaka K. , Descriptive set theory and subsystems of analysis, Ph.D. thesis, University of California, Berkeley, 1986.
3. Subsystems of Second Order Arithmetic
4. Bar induction and ω-model reflection;Gerhard;Annals of Pure and Applied Logic,1999
5. Higher set theory and mathematical practice