(:linebreaks:)

https://daily.jstor.org/the-nitty-gritty-on-reduplication-so-good-you-have-to-say-it-twice/
http://www.arch.apsl.edu.pl/polilog/pliki/nr6/21.pdf
http://linguistics.berkeley.edu/~inkelas/Papers/2013HandbookOfDerivationInkelas.pdf

http://www.arch.apsl.edu.pl/polilog/pliki/nr6/21.pdf

Contrastive reduplication
https://ase.tufts.edu/cogstud/jackendoff/papers/salad-salad.pdf

Cross-linguistic
https://journals.uair.arizona.edu/index.php/AZSLAT/article/download/21274/20854
https://www.sas.upenn.edu/~haroldfs/echoword/

Corpus
http://ucrel.lancs.ac.uk/publications/CL2003/papers/wang.pdf

USE these regular expression for concordance: 

(\W|^)([A-Za-z,]+\s)\2  for full duplications with or without commas

(\W|^)([A-Za-z,]+)(\sAND\s)\2 x and x

(\W|^)([A-Za-z,]+)(\sor\s)\2  x or x

test them here: https://www.regextester.com/93564