@article {aChang09,
	title = {Trajectory tree as an object-oriented hierarchical representation for video},
	journal = {IEEE transactions on circuits and systems for video technology},
	volume = {19},
	number = {4},
	year = {2009},
	pages = {547{\textendash}560},
	issn = {1051-8215},
	author = {Chang, C. and M. Pard{\`a}s and Marqu{\'e}s, F.}
}
