@misc {MATHEDUC.02455621,
    author       = {Kieffer, L.},
    title        = {Spatial diagrams. Stereoskopische Bilder(Les anaglyphes).},
    howpublished = {Processes of geometrisation and visualization. Proceedings. Geometrie und Anschauung(Processus de geometrisation et de visualisation). Proceedings(Compte rendus). Editor(s): Pellerey, M. International Commission for the Study and Improvement of Mathematics Teaching nd . p. 195-201 of 360 p. Conference: 33. CIEAEM meeting on processes of geometrisation and visualization, Verbania Pallanza (Italy), 2-9 Aug 1981},
    msc2010      = {G40xx},
    identifier   = {1983e.00678},
}