_:b57021884 <http://www.w3.org/ns/oa#hasSelector> _:b57021885 . _:b57021885 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b57021885 <http://www.w3.org/ns/oa#exact> "severity" . _:b57021884 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/852dc923b7f260167aae1eb268f373e5a2c64415/3> .