1. Infinitary logic and admissible sets;Barwise;J. Symbolic Logic,1969
2. Absolute logics and L∞ω;Barwise;Ann. Math. Logic,1972
3. A preservation theorem for interpreatations, Cambridge Summer School in Math. Logic;Barwise,1973
4. Back and forth through Infinitary logic;Barwise,1973
5. Hanf numbers for fragments of L∞ω;Barwise;Israel J. Math.,1971