1. Intrinsically recursive relations;Ash,1981
2. R.G. Downey, Recursion theory and linear orderings, in: Handbook of Effective Algebra, to appear.
3. R.G. Downey and C.G. Jockusch, Every low boolean algebra is isomorphic to a recursive one, Proc. Amer. Math. Soc., to appear.
4. Recursive linear orderings with incomplete successivities;Downey;Trans. Amer. Math. Soc.,1991
5. Orderings and Boolean Algebras not Isomorphic to Recursive Ones;Feiner,1967