On coordination reduction and sentence analysis. - Stanley R. Petrick; Paul M. Postal; Peter S. Rosenbaum (Commun. ACM, 1969)

Comments on Pullum's Criticisms. - D. Terence Langendoen; Paul M. Postal (Comput. Linguistics, 1984)

English and the Class of Context-Free Languages. - Paul M. Postal; D. Terence Langendoen (Comput. Linguistics, 1984)