<http://ns.inria.fr/covid19/PMC6222927#body_text>	<http://purl.org/dc/terms/subject>	"Comics characters introduced in 1959" .
<http://ns.inria.fr/covid19/PMC6222927#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC6222927#body_text>	<http://purl.org/dc/terms/subject>	"Homogeneous catalysis" .