<http://ns.inria.fr/covid19/PMC7127499#body_text>	<http://purl.org/dc/terms/subject>	"Eurozone crisis" .
<http://ns.inria.fr/covid19/PMC7127499#body_text>	<http://purl.org/dc/terms/subject>	"316 BC" .
<http://ns.inria.fr/covid19/PMC7127499#body_text>	<http://purl.org/dc/terms/subject>	"Network theory" .