<http://ns.inria.fr/covid19/PMC3203193#body_text>	<http://purl.org/dc/terms/subject>	"Network theory" .
<http://ns.inria.fr/covid19/PMC3203193#body_text>	<http://purl.org/dc/terms/subject>	"2000 albums" .
<http://ns.inria.fr/covid19/PMC3203193#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .