1. Lattice Theory;Birkhoff,1967
2. Algebraic and Automata-Theoretic Properties of Formal Languages;Ginsburg,1975
3. The dynamics of piecewise endomorphisms of finitely-generated free monoids;Harrison,1993
4. Dynamical properties of PWD0L systems;Harrison;Theoret. Comput. Sci.,1995
5. The set of strings mapped into a submonoid by iterates of a morphism;Head;Theoret. Comput. Sci.,1991