{{Cite conference| publisher = communication orale| conference = Cycle de conférences 2013 France-Afrique du Sud, Les grands défis démographiques du 21e siècle| last1 = Henaff| first1 = Nolwen| last2 = Lange| first2 = Marie-France| title = The Importance of Starting School at the Right Age: Number and Rank of Siblings and Schooling in the Northern Periphery of Ouagadougou| location = Paris, France| date = 2013-12-03}}