Source: https://www.researchgate.net/profile/Francis_Rousseaux/publication/237607129_Similarite_en_intension_vs_en_extension_a_la_croisee_de_l'informatique_et_du_theatre/links/0c960529762f2ef59d000000/Similarite-en-intension-vs-en-extension-a-la-croisee-de-linformatique-et-du-theatre.pdf