Banaru, A. M.; Banaru, G. A. (August 2011), "Cairo tiling and the topology of layered hydrates", Moscow University Chemistry Bulletin, 66 (3), Article 159, doi:10.3103/S0027131411030023, S2CID96002269
Haag, F. (1911), "Die regelmäßigen Planteilungen", Zeitschrift für Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie, 49: 360–369, hdl:2027/uc1.b3327994 See in particular Figures 2b, p. 361, and 4a, p. 363.
Banaru, A. M.; Banaru, G. A. (August 2011), "Cairo tiling and the topology of layered hydrates", Moscow University Chemistry Bulletin, 66 (3), Article 159, doi:10.3103/S0027131411030023, S2CID96002269