<http://ns.inria.fr/covid19/PMC2779504#body_text>	<http://purl.org/dc/terms/subject>	"Differential equations" .
<http://ns.inria.fr/covid19/PMC2779504#body_text>	<http://purl.org/dc/terms/subject>	"History of Ecuador" .
<http://ns.inria.fr/covid19/PMC2779504#body_text>	<http://purl.org/dc/terms/subject>	"History of aviation" .