2026-03-07T12:32:42Z http://popups.uliege.be/oai/oai2.php PoPuPS ULiege http://popups.uliege.be/oai/oai2.php 2.0 2006-01-01T00:00:00Z persistent YYYY-MM-DDThh:mm:ssZ s.danhieux@uliege.be