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@article{Authenticus:P-000-HCH,
	title = {{Periodicity vectors for labelled trees}},
	author = {A Restivo and PV Silva},
	doi = {10.1016/s0166-218x(02)00248-2},
	journal = {Discrete Applied Mathematics},
	number = {2-3},
	pages = {241-260},
	publisher = {Elsevier Science Bv},
	type = {Article},
	volume = {126},
	year = {2003}
}