@article {380,
	title = {Model Theory of XPath on Data Trees. Part {I:} Bisimulation and Characterization},
	journal = {J. Artif. Intell. Res. {(JAIR)}},
	volume = {53},
	year = {2015},
	pages = {271{\textendash}314},
	doi = {10.1613/jair.4658},
	url = {http://dx.doi.org/10.1613/jair.4658},
	author = {Diego Figueira and Santiago Figueira and Carlos Areces}
}