Merge pull request #81 from JoaoGFarias/master

Gamification: Creating folder and adding some papers

gamification/README.md

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+# Gamification
+
+## External Papers
+
+* [Defining Gamification - A Service Marketing Perspective](http://www.hiit.fi/u/hamari/Defining_Gamification-A_Service_Marketing_Perspective.pdf)
+
+* [Design Requirements for Technologies that Encourage Physical Activity](http://www.katherineeveritt.com/papers/p457-consolvo.pdf)
+
+* [Exploring the Potential of Gamification Among Frail Elderly Persons](http://gamification-research.org/wp-content/uploads/2011/04/12-Gerling.pdf)
+
+* [From Game Design Elements to Gamefulness: Defining “Gamification”](http://dl.dropboxusercontent.com/u/220532/MindTrek_Gamification_PrinterReady_110806_SDE_accepted_LEN_changes_1.pdf)
+
+* [MoviPill: Improving Medication Compliance for Elders - Using a Mobile Persuasive Social Game](http://www.ic.unicamp.br/~oliveira/doc/Ubicomp2010_MoviPill.pdf)
+
+* [Removing Gamification from an Enterprise SNS](http://www.jennthom.com/papers/gamification.pdf)