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United States of America. Khan Academy (Khan Academy, 2016)

United States of America. Khan Academy (Khan Academy, 2012)

Lichtblau, Sarah (2016)

Schulz, Eric (2011)

Schulz, Eric (2016)

Bryant, Jeff (2016)

Mejía, Sergio Hannibal (2016)

Mentrard, Daniel (Mathematiques et sciences physiques, 2016)

Mejía, Sergio Hannibal (2011)

Mentrard, Daniel (Mathematiques et sciences physiques, 2012)