Nature.com subject ontology	Astronomical Subject Keywords (2013)	Source
http://voparis-ns.obspm.fr/rdf/editors/astro-subjects-keywords#astrobiology	http://scigraph.springernature.com/things/subjects/astrobiology	LOOM
http://voparis-ns.obspm.fr/rdf/editors/astro-subjects-keywords#astrochemistry	http://scigraph.springernature.com/things/subjects/astrochemistry	LOOM
http://voparis-ns.obspm.fr/rdf/editors/astro-subjects-keywords#standards	http://scigraph.springernature.com/things/subjects/standards	LOOM
http://voparis-ns.obspm.fr/rdf/editors/astro-subjects-keywords#stars	http://scigraph.springernature.com/things/subjects/stars	LOOM
http://voparis-ns.obspm.fr/rdf/editors/astro-subjects-keywords#cosmology	http://scigraph.springernature.com/things/subjects/cosmology	LOOM