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Table 1 Distribution of retrieved papers among sources

From: Gamifying education: what is known, what is believed and what remains uncertain: a critical review

Database Total Amount No of Selected
ACM Digital Library 285 12 + 1a
Google Scholar 4021 21 + 8a
IEEE Explore 574 6
ScienceDirect 158 12 + 3a
  1. Note: aTheoretical Papers