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https://theconversation.com/les-resso...atives-libres-un-enjeu-davenir-170153
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http://www.ecolebranchee.com/2016/02/...ources-educatives-libres-et-gratuites
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http://www.actualitte.com/pedagogies/...e-pour-les-rendre-credibles-39532.htm
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