Fraw: Sampling-Based Approximate Query Processing for Federations of SPARQL endpoints. - Erwan Boisteau-Desdevises; Thi Hoang Thi Pham; Gabriela Montoya; Brice Nédelec; Hala Skaf-Molli; Pascal Molli (ISWC (Industry/Doctoral Consortium/Posters/Demos), 2025)