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