<http://ns.inria.fr/covid19/PMC3836038#title>	<http://purl.org/dc/terms/subject>	"Network flow problem" .
<http://ns.inria.fr/covid19/PMC3836038#title>	<http://purl.org/dc/terms/subject>	"1968 introductions" .
<http://ns.inria.fr/covid19/PMC3836038#title>	<http://purl.org/dc/terms/subject>	"Mathematical paradoxes" .
<http://ns.inria.fr/covid19/PMC3836038#title>	<http://purl.org/dc/terms/subject>	"Game theory" .