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Hutchins, W. John (1975). Languages of indexing and classification. A linguistic study of structures and functions. London: Peter Peregrinus.
Hutchins, W. John (1977). On the Problem of "Aboutness" in Document Analysis. Journal of Informatics, 1, 17-35.
Hutchings, W. John (1978). The concept of "aboutness" in subject indexing. Aslib Proceedings, 30, 172-181.
Hutchings, W. John (2006). Machine translation: history of research and use. In: Encyclopedia of Languages and Linguistics. 2nd edition, edited by Keith Brown (Oxford: Elsevier 2006), vol.7, pp. 375–383. PDF, 445KB.