Tree Pushdown Automata. - Karl M. Schimpf; Jean H. Gallier (J. Comput. Syst. Sci., 1985)

A practical arbitrary look-ahead LR parsing technique. - Manuel E. Bermudez; Karl M. Schimpf (SIGPLAN Symposium on Compiler Construction, 1986)

On the (non-) Relationship between SLR(1) and NQLALR(1) Grammars. - Manuel E. Bermudez; Karl M. Schimpf (ACM Trans. Program. Lang. Syst., 1988)

Practical Arbitrary Lookahead LR Parsing. - Manuel E. Bermudez; Karl M. Schimpf (J. Comput. Syst. Sci., 1990)