<http://ns.inria.fr/covid19/PMC7222154#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC7222154#body_text>	<http://purl.org/dc/terms/subject>	"Differential equations" .
<http://ns.inria.fr/covid19/PMC7222154#body_text>	<http://purl.org/dc/terms/subject>	"Towns in South Australia" .