<http://ns.inria.fr/covid19/PMC3832450#body_text> <http://purl.org/dc/terms/subject> "Physical chemistry" . <http://ns.inria.fr/covid19/PMC3832450#body_text> <http://purl.org/dc/terms/subject> "Smallpox vaccines" . <http://ns.inria.fr/covid19/PMC3832450#body_text> <http://purl.org/dc/terms/subject> "Insect vectors of plant pathogens" .