@INPROCEEDINGS{BBL04a,
  title = {{A Core Calculus of Higher-Order Mixins and Classes (Poster Abstract)}},
  author = {Bettini, Lorenzo and Bono, Viviana and Likavec, Silvia},
  booktitle = {Proc. of ACM Symposium on Applied Computing (SAC 2004)},
  pages = {1508-1509},
  year = {2004},
  publisher = {ACM Press},
}