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Systematic review


I am currentlying completing a systematic review. I understand that the whole point of them is to have strict search criteria from which they can be repeatable.
My searches turned up 5 papers which match the criteria. Within these 5 papers, many of them reference an extra 2 papers which were not identified within the search criteria. I'll call the papers X and Y for the sake of it. X and Y happen to be really useful, contain lots of data and other than not being on the search engines used, match the inclusion criteria!
Is there anyway that i can add X and Y to my pool of identified papers, or am i just stuck. I dont want to expand my search criteria and risk discovering an extra 10 papers to write about (i admit this systematic review is sounding pretty biased....).

Did you figure this out?

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