@article{JGG_2021_25_1_JGG_2021_25_1_a7,
     author = {F. Giudiceandrea and L. Grasselli },
     title = {From {M.} {C.} {Escher's} {Hexagonal} {Tiling} to the {Kiepert} {Hyperbola}},
     journal = {Journal for geometry and graphics},
     pages = {79--95},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2021},
     url = {http://geodesic.mathdoc.fr/item/JGG_2021_25_1_JGG_2021_25_1_a7/}
}