Empirical literature studies: studying academic literature as a shortcut to learning about academic practice are common in many fields. 

Bryman, Alan. "Why do researchers integrate/combine/mesh/blend/mix/merge/fuse quantitative and qualitative research." Advances in mixed methods research (2008): 87-100.

(we used the technique in)

 van Turnhout, K, et al. "Design patterns for mixed-method research in HCI." Proceedings of the 8th Nordic Conference on Human-Computer Interaction: Fun, Fast, Foundational. ACM, 2014.

However, are there any academic standards for this aproach? Is there a good article describing rules for sampling, analysis and conclusions etc. 

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