Which one was published first, 'Dynamic Active-Passive Beamforming for Intelligent Reflecting Surface Aided UAV Communications' or 'Vision based global localisation using a 3D environmental model created by a laser range scanner'?
Between 'Dynamic Active-Passive Beamforming for Intelligent Reflecting Surface Aided UAV Communications' and 'Vision based global localisation using a 3D environmental model created by a laser range scanner', which paper was published earlier?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/conf/globecom/Zhu0GGTX21> <https://dblp.org/rdf/schema#yearOfPublication> ?x . <https://dblp.org/rec/conf/iros/HoJ08> <https://dblp.org/rdf/schema#yearOfPublication> ?y . BIND(IF(?x < ?y, <https://dblp.org/rec/conf/globecom/Zhu0GGTX21>, <https://dblp.org/rec/conf/iros/HoJ08>) AS ?answer) }
<https://dblp.org/rec/conf/globecom/Zhu0GGTX21> <https://dblp.org/rec/conf/iros/HoJ08>