@inproceedings{Schr91a,
   author = {M.~Schrefl},
   booktitle = {{The Core of Conceptual Modelling, Proc. of the 9th International Conference on Entity-Relationship Approach (ER `90), Lausanne, Switzerland, October 8--10, 1990}},
   editor = {H.~Kangassalo},
   pages = {113--128},
   publisher = {Elsevier Science B.V. (North-Holland)},
   title = {{Behavior Modeling by Stepwise Refining Behavior Diagrams}},
   year = {1991}
}
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