Verheyen, Hugo F. (1996), "Chapter 4: Classification of the finite compounds of cubes", Symmetry Orbits, Design Science Collection, Boston: Birkhäuser, pp. 95–159, doi:10.1007/978-1-4612-4074-7_5, ISBN0-8176-3661-7, MR1363715; see in particular p. 136.
Verheyen, Hugo F. (1996), "Chapter 4: Classification of the finite compounds of cubes", Symmetry Orbits, Design Science Collection, Boston: Birkhäuser, pp. 95–159, doi:10.1007/978-1-4612-4074-7_5, ISBN0-8176-3661-7, MR1363715; see in particular p. 136.
Verheyen, Hugo F. (1996), "Chapter 4: Classification of the finite compounds of cubes", Symmetry Orbits, Design Science Collection, Boston: Birkhäuser, pp. 95–159, doi:10.1007/978-1-4612-4074-7_5, ISBN0-8176-3661-7, MR1363715; see in particular p. 136.