@article{article9612dea2,
title   = {Automated instructional design for CSCL: a hierarchical task network planning approach},
author = {Challco, Geiser Chalco and Gerosa, Marco Aurélio and Bittencourt, Ig Ibert and Isotani, Seiji},
year = {2014},
doi = {10.1016/j.eswa.2013.12.016},
journal   = {Expert Systems with Applications}
}