Fix up for missing link.

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Zeeshan Lakhani 10 years ago
parent 6634b4dac5
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## External Papers
* [Defining Gamification - A Service Marketing Perspective](http://www.hiit.fi/u/hamari/Defining_Gamification-A_Service_Marketing_Perspective.pdf)
* [Defining Gamification - A Service Marketing Perspective](http://www.rolandhubscher.org/courses/hf765/readings/p17-huotari.pdf)
* [Design Requirements for Technologies that Encourage Physical Activity](http://www.katherineeveritt.com/papers/p457-consolvo.pdf)

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