1. Quasi-simple relations in copies of a given recursive structure;Ash;Ann. Pure Appl. Logic,1997
2. Intrinsically recursive relations;Ash,1981
3. A theorem on hypersimple sets;Dekker;Proc. Amer. Math. Soc.,1954
4. Computable algebras and closure systems: coding properties;Downey,1998
5. S.S. Goncharov, V.S. Harizanov, J.F. Knight, C.F.D. McCoy, Simple and immune relations on countable structures, Arch. Math. Logic, to appear.