Assertion: grey literature | /r/HasProperty | discussed with reference
Facets:
value: often
type: TEMPORAL
value: to scientific research
type: OTHER
Source sentences:
text: Although grey literature is often discussed with reference to scientific research, it is by no means restricted to any one field: outside the hard sciences, it presents significant challenges in archaeology where site surveys and excavation reports, containing unique data, have frequently been produced and circulated in informal "grey" formats.