@conference {Ramos2004_2,
	title = {Models for series of studies with r-order common structure: application to European Union Integration},
	booktitle = {Proceedings of Summer School DATASTAT03},
	series = {15},
	year = {2004},
	pages = {273-278},
	author = {Lu{\'\i}s Ramos and Manuela Oliveira and Jo{\~a}o T. Mexia and Christoph. Minder}
}
