I need a bit more information to answer your question. Are you looking for differentiation for any particular subject area? Here's one focused on reading:

Testing the impact of child characteristics × instruction interactions on third graders’ reading comprehension by differentiating literacy instruction.

Connor, Carol McDonald; Morrison, Fredrick J.; Fishman, Barry; Giuliani, Sarah; Luck, Melissa; Underwood, Phyllis S.; Bayraktar, Aysegul; Crowe, Elizabeth C.; Schatschneider, Christopher

Reading Research Quarterly, Vol 46(3), Jul-Sep 2011, 189-221.

Imogen:

Here's  a link to available studies in RG on your topic:

https://www.researchgate.net/publicliterature.PublicLiterature.search.html?type=keyword&search-keyword=differentiation+in+the+primary+classroom&search-abstract=&search=Search

Best regards,

Debra

bbcactive

http://www.bbcactive.com/BBCActiveIdeasandResources/MethodsofDifferentiationintheClassroom.aspx

Following articles may be useful

http://www2.uwstout.edu/content/lib/thesis/2011/2011gangis.pdf

http://www.tandfonline.com/doi/full/10.1080/02619760600795122

http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9345.2008.00470.x/abstract;jsessionid=C9122E859610574902C6E16B27D16930.f01t03?userIsAuthenticated=false&deniedAccessCustomisedMessage=

Look at the work by Susen Smith (also at UNSW) and the Model of Dynamic Differentiation (2009, 2015) and other work. 

Try these links:

http://search.informit.com.au/documentSummary;dn=433444307823979;res=IELHSS

https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwip5ZzDo7rJAhXJfhoKHcbbCe4QFggcMAA&url=https%3A%2F%2Feducation.arts.unsw.edu.au%2Fmedia%2FEDUCFile%2FKEYNOTE_Susen_Smith.pdf&usg=AFQjCNEBss_CK1nnqY7nmGKEUr19pK3lEw