D. Ackley, D. Cannon, and L. Williams. The Computer Journal, 56 (12):
1450--1468(2013)tex.eprint: http://comjnl.oxfordjournals.org/content/56/12/1450.full.pdf+html.
D. Berry, and D. Broadbent. The Quarterly Journal of Experimental Psychology Section A, 36 (2):
209--231(1984)Citation Key: berry1984relationship
bibtexpublisher=SAGE Publications Sage UK: London, England.