@article{JGG_2017_21_1_JGG_2017_21_1_a0,
     author = {D. Dunham and J. Shier },
     title = {Periodic {Fractal} {Patterns}},
     journal = {Journal for geometry and graphics},
     pages = {1--6},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2017},
     url = {http://geodesic.mathdoc.fr/item/JGG_2017_21_1_JGG_2017_21_1_a0/}
}