"422","External and internal choice with event groups in Event-B","","http://deploy-eprints.ecs.soton.ac.uk/422/","Butler, Michael","UNSPECIFIED","       <span class=\"person_name\">Butler, Michael</span>     (2012)  <a href=\"http://deploy-eprints.ecs.soton.ac.uk/422/\"><em>External and internal choice with event groups in Event-B.</em></a>       FORMAL ASPECTS OF COMPUTING, 24        (4-6).           pp. 555-567.                ","","2012"
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