![File:W. Martens - Etta Arnolda Lunsingh-Tonckens (1863-1914). Echtgenote van Dr. Daniel Francois Scheurleer D.F. Scheurleer - C1174 - Instituut Collectie Nederland.jpg - Wikimedia Commons File:W. Martens - Etta Arnolda Lunsingh-Tonckens (1863-1914). Echtgenote van Dr. Daniel Francois Scheurleer D.F. Scheurleer - C1174 - Instituut Collectie Nederland.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/e/e8/W._Martens_-_Etta_Arnolda_Lunsingh-Tonckens_%281863-1914%29._Echtgenote_van_Dr._Daniel_Francois_Scheurleer_D.F._Scheurleer_-_C1174_-_Instituut_Collectie_Nederland.jpg)
File:W. Martens - Etta Arnolda Lunsingh-Tonckens (1863-1914). Echtgenote van Dr. Daniel Francois Scheurleer D.F. Scheurleer - C1174 - Instituut Collectie Nederland.jpg - Wikimedia Commons
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What We Know About CSCL: And Implementing It In Higher Education (Computer-Supported Collaborative Learning Series, 3): Strijbos, Jan-Willem, Kirschner, Paul A., Martens, Rob L.: 9781402077791: Amazon.com: Books
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Dr. Martens sues shoemaker Chinese Laundry for 'deliberately' using trademarked designs on boots | Daily Mail Online
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