Glossary entry (derived from question below)
Spanish term or phrase:
literatura gris
English translation:
Grey (or gray) literature
Spanish term
Colombia
Specialty: bioscience
Native in: Spanish (Variant: Colombian) 
Works in: English to Spanish, French to Spanish, Spanish to English
literatura gris
Context: "El 77% de los artículos corresponden a publicaciones científicas y 23% a literatura gris".
| 4 +2 | Grey (or gray) |
Yvonne Gallagher
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| 5 +6 | gray literature |
Barbara Cochran, MFA
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Jun 23, 2015 23:39: philgoddard changed "Field" from "Science" to "Other" , "Field (specific)" from "Linguistics" to "Printing & Publishing" , "Field (write-in)" from "technical and scientific publications" to "(none)"
Jul 1, 2015 07:46: Yvonne Gallagher Created KOG entry
Jul 1, 2015 07:47: Yvonne Gallagher changed "Edited KOG entry" from "<a href="/profile/1300525">Yvonne Gallagher's</a> old entry - "literatura gris"" to ""Grey (or gray)""
Non-PRO (2): philgoddard, Jane Martin
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Proposed translations
Ireland
right word, right place. everytime
Native in: English (Variants: US, Canadian, Irish, UK)
Works in: French to English, Spanish to English, English, and 1 more.
Grey (or gray)
So, it's really your choice, depending on your target of course
https://en.wikipedia.org/wiki/Grey_literature
http://csulb.libguides.com/graylit
http://libguides.ecu.edu/greylit.
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Note added at 9 hrs (2015-06-24 08:03:50 GMT)
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Barbara's answer wasn't there when I started researching this. So, initially I would have though "simple" as well, the usual US/UK spelling divide but when I looked into it it was NOT so simple. Many US institutions/universities use the spelling "grey" for this. Including here
http://guides.temple.edu/grey-literature
http://guides.lib.umich.edu/greyliterature
http://libguides.fau.edu/content.php?pid=500544&sid=4748615
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Note added at 9 hrs (2015-06-24 08:15:29 GMT)
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http://www.greynet.org/greysourceindex.html
http://guides.library.upenn.edu/healthgreylit?hs=a
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Note added at 7 days (2015-07-01 07:45:08 GMT) Post-grading
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Glad to have helped...and I learned something as well!
| Dear Gallagy: you are absolutely right, it was not so simple. Thank you! |
| agree |
Wilsonn Perez Reyes
: Probably because the spelling "gray" can be confused with other types of literature.
1 hr
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Many thanks:-)
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| agree |
Helena Chavarria
: I don't know why more people agree with 'gray', when 'grey' appears to be more common.
8 hrs
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Many thanks:-) That's the way I see it too.
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United States
Laudable Lady Linguist
Native in: English 
Works in: Spanish to English, French to English, English to Spanish, and 3 more.
gray literature
| agree |
Adoración Bodoque Martínez
12 mins
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Gracias, Adoración.
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| agree |
philgoddard
: Or grey for the UK.
28 mins
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Thanks, philgoddard
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| agree |
Muriel Vasconcellos
: It refers to pamphlets, reports, and other loose resources that are sometimes hard to catalog because the authorship isn't clear. There are different cataloguing rules for gray literature (I worked in a library cataloguing department).
38 mins
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Thanks, Muriel.
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| agree |
Fabio M. Caldas
1 hr
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Gracias, Fabio.
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| agree |
Danik 2014
1 hr
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Thanks, Danik 2014.
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| neutral |
Helena Chavarria
: You don't provide any references that justify a confidence level of 5.
8 hrs
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Sure I did-google.
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| agree |
Jaime Hyland
: Sometimes (just sometimes) references are superfluous.
9 hrs
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Thanks, Jaime.
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| neutral |
Yvonne Gallagher
: Refs. are not "superfluous" here at all imo. but rather prove it's not as simple as it looks.//the fact is that "grey literature" is far more commonly used, even in the US
9 hrs
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It's no opinion-It's a fact. Hence, the "5".
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Reference comments
Spain
Striving for excellence
Native in: English (Variant: British)
Works in: Spanish to English, Catalan to English
Grey Literature
The Fourth International Conference on Grey Literature (GL '99) in Washington, DC, in October 1999 defined grey literature as follows: "That which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers."
http://www.greylit.org/about
Grey literature is generally defined as academic literature that is not formally published. It is an expanding field in library and information science that deals with the supply and demand side of publications not controlled by commercial publishing.
Research in this field of information has been systematically documented and archived via the International Conference Series on Grey Literature (1993, Vol.1)...(2014, Vol.16) and The Grey Journal (2005, Vol.1)...(2014, Vol.10) a flagship journal for the grey literature community. On 16 May 2014, the Pisa Declaration on Policy Development for Grey Literature Resources was ratified and published.
https://en.wikipedia.org/wiki/Grey_literature
http://www.greylit.org/publishers/list?letter=B
| Muchas gracias, Helena. |
| agree |
Yvonne Gallagher
: There's simple Googling and then there's (cross-referencing) research. Some people don't seem to know the difference:-)
12 hrs
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You're so right! Thank you, Gallagy ;-)
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Germany
45 years experience
Native in: English (Variant: British)
Works in: German to English, French to English, Spanish to English, and 2 more.
| neutral |
Yvonne Gallagher
: En > Sp glossary and doesn't answer Asker's question
4 hrs
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Discussion