<http://ns.inria.fr/covid19/PMC7309481#body_text>	<http://purl.org/dc/terms/subject>	"20th-century American mathematicians" .
<http://ns.inria.fr/covid19/PMC7309481#body_text>	<http://purl.org/dc/terms/subject>	"1978 deaths" .
<http://ns.inria.fr/covid19/PMC7309481#body_text>	<http://purl.org/dc/terms/subject>	"Logical expressions" .