<http://ns.inria.fr/covid19/PMC7302538#body_text>	<http://purl.org/dc/terms/subject>	"Perimeter security" .
<http://ns.inria.fr/covid19/PMC7302538#body_text>	<http://purl.org/dc/terms/subject>	"Global Positioning System" .
<http://ns.inria.fr/covid19/PMC7302538#body_text>	<http://purl.org/dc/terms/subject>	"Evaluation methods" .