Karlis Cerans Julija Ovcinnikova Mikus Grasmanis Lelde Lace Aiga Romane Visual Presentation of SPARQL Queries in ViziQuer. 29-40 2021 VOILA@ISWC https://ceur-ws.org/Vol-3023/paper12.pdf conf/semweb/2021voila db/conf/semweb/voila2021.html#CeransOGLR21