Source: https://www.researchgate.net/profile/Guillaume_Damiand/publication/30518247_Definition_et_etude_d'un_modele_topologique_minimal_de_representation_d'images_2d_et_3d/links/54eedb6a0cf25238f93b46d3/Definition-et-etude-dun-modele-topologique-minimal-de-representation-dimages-2d-et-3d.pdf