@workingPaper{AndréGrafHeinsohnNebelProfitlichRistWahlster_1993,
title={PPP - personalized plan-based presenter},
author={André, Elisabeth and Graf, Winfried and Heinsohn, Jochen and Nebel, Bernhard and Profitlich, Hans-Jürgen and Rist, Thomas and Wahlster, Wolfgang},
doi={http://dx.doi.org/10.22028/D291-25340},
year={1993}
}