What is the meaning of these constant interruptions?

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Bibliographic Details
Title:	What is the meaning of these constant interruptions?
Authors:	GRAHAM HUTTON¹, JOEL WRIGHT¹
Source:	Journal of Functional Programming. Nov2007, Vol. 17 Issue 6, p777-792. 16p.
Database:	Mathematics Source

Description
ISSN:	09567968
DOI:	10.1017/S0956796807006363