Van Rooyen, H.O.; Weiermans, D.J.
(Computer Society of South Africa (on behalf of SAICSIT), 1983)
Nebula modell_ing is_ a generalised structural modelling technique which applies to any finite set of objects (entities)
and n-ary relat1onsh1ps (n ~2). A nebula model can be presented in either diagrammatic or tabular ...