Zdenek Zdráhal Paul Mulholland Michael Valásek Ansgar Bernardi Worlds and transformations: Supporting the sharing and reuse of engineering design knowledge. 959-982 2007 65 International Journal of Man-Machine Studies 12 http://dx.doi.org/10.1016/j.ijhcs.2007.07.004 db/journals/ijmms/ijmms65.html#ZdrahalMVB07