1. Domain theory;Abramsky,1994
2. Introduction to Lattices and Order;Davey,1994
3. On a hierarchy of sets 1,2,3;Ershov;Algebra i Logika,1968
4. Theory of domains and nearby;Ershov,1993
5. Hierarchies of function classes defined by the first-value operator;Hemmerling;RAIRO – Theoretical Informatics and Applications,2008