Literature

[1]
Patrick Eyerich, Robert Mattmüller and Gabriele Röger.
Using the Context-enhanced Additive Heuristic for Temporal and Numeric Planning.
In Proceedings of the 19th International Conference on Automated Planning and Scheduling (ICAPS 2009), 2009.
(PDF)
[2]
Malte Helmert and Héctor Geffner.
Unifying the Causal Graph and Additive Heuristics.
In Proceedings of the 18th International Conference on Automated Planning and Scheduling (ICAPS 2008), pp. 140-147, 2008.
(PDF)