Grünbaum, Branko (1999), "Acoptic polyhedra"(PDF), Advances in discrete and computational geometry (South Hadley, MA, 1996), Contemporary Mathematics, vol. 223, Providence, Rhode Island: American Mathematical Society, pp. 163–199, doi:10.1090/conm/223/03137, ISBN978-0-8218-0674-6, MR1661382; for the three non-convex acoptic hexahedra see p. 7 of the preprint version and Fig. 3, p. 30
Grünbaum, Branko (1999), "Acoptic polyhedra"(PDF), Advances in discrete and computational geometry (South Hadley, MA, 1996), Contemporary Mathematics, vol. 223, Providence, Rhode Island: American Mathematical Society, pp. 163–199, doi:10.1090/conm/223/03137, ISBN978-0-8218-0674-6, MR1661382; for the three non-convex acoptic hexahedra see p. 7 of the preprint version and Fig. 3, p. 30
Grünbaum, Branko (1999), "Acoptic polyhedra"(PDF), Advances in discrete and computational geometry (South Hadley, MA, 1996), Contemporary Mathematics, vol. 223, Providence, Rhode Island: American Mathematical Society, pp. 163–199, doi:10.1090/conm/223/03137, ISBN978-0-8218-0674-6, MR1661382; for the three non-convex acoptic hexahedra see p. 7 of the preprint version and Fig. 3, p. 30