@article{Schr98a,
   author = {M.~Schrefl AND G.~Kappel AND P.~Lang},
   journal = {{Journal Data \& Knowledge Engineering (DKE)}},
   month = jun,
   number = {2},
   pages = {191--224},
   title = {{Modeling collaborative behavior using cooperation contracts}},
   volume = {26},
   year = {1998}
}
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