@book { Letempsdinstruire,
    title = "Le temps d’instruire",
    subtitle = "Approche clinique et expérimentale du didactique ordinaire en mathématique",
    author = "Francia {Leutenegger}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1105925"
}