_:b57803725	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57803725	<http://www.w3.org/ns/oa#exact>	"concentration" .
_:b57803724	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/0ca416b6b52c41d0479a919f0d2764dd52ca8746/0> .
_:b57803724	<http://www.w3.org/ns/oa#hasSelector>	_:b57803725 .