@Article{hoffmann:jair-11,
  author = 	 {J{\"o}rg Hoffmann},
  title = 	 {Analyzing Search Topology Without Running Any
Search: On the Connection Between Causal Graphs and $h^+$},
  journal = 	 jair,
  year = {2011},
  volume = {41},
  pages = {155-229}
}

@STRING{jair  = "Journal of Artificial Intelligence Research"}