Bryn R. Marshall Jessie B. Kennedy Peter J. Barclay bclasses: A construct and method for modelling co-operative object behaviour. 351-361 1997 39 Information & Software Technology 5 http://dx.doi.org/10.1016/S0950-5849(96)01151-2 db/journals/infsof/infsof39.html#MarshallKB97