Liu, J., L. Kuhn, J. de Kleer, and R. Zhou. “Pervasive Model Adaptation: The Integration of Planning and Information Gathering in Dynamic Production Systems”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 19, no. 1, Oct. 2009, pp. 225-32, doi:10.1609/icaps.v19i1.13354.