<http://ns.inria.fr/covid19/PMC7115523#body_text>	<http://purl.org/dc/terms/subject>	"Lists of countries" .
<http://ns.inria.fr/covid19/PMC7115523#body_text>	<http://purl.org/dc/terms/subject>	"History of North Africa" .
<http://ns.inria.fr/covid19/PMC7115523#body_text>	<http://purl.org/dc/terms/subject>	"Partial differential equations" .