1. Tame models in the isols;Barback;Houston J. Math.,1986
2. The minimum of two regressive isols;Dekker;Math. Z.,1964
3. A note on a theorem of H. Friedman;Dimitracopoulos;Z. Math. Logik Grundlag. Math.,1988
4. Universal isols;Ellentuck;Math. Z.,1967