<http://ns.inria.fr/covid19/PMC7416418#body_text>	<http://purl.org/dc/terms/subject>	"Romani in Portugal" .
<http://ns.inria.fr/covid19/PMC7416418#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC7416418#body_text>	<http://purl.org/dc/terms/subject>	"Fuel gas" .