: Mikrowellen (Funk-Technik Bühker) — The source of the text sample, used to investigate the power of algorithmic lemmatisation techniques, in relation to German text.
: On the Establishment of a Standard Set of Algol 60 Procedures for Use in Automatic Language Processing (Article, Journal of I.T.L. n10) — Certain procedures used in my algorithms are identical to those proposed by Mr. Johnson, and a more comprehensive explanation is given in this article.
: Introduction to Computational Linguistics (Macdonald London 1967) — Computer representations of tree structures, and the associated operations, are discussed in chapters 2 to 5.