@article{JGG_2019_23_2_JGG_2019_23_2_a9,
     author = {Y. Tsuji and H. Suzuki},
     title = {Geometric {Feature} of a {Structure} {Composed} of {Concave} and {Convex} {Parabolic} {Mirrors}},
     journal = {Journal for geometry and graphics},
     pages = {235--244},
     year = {2019},
     volume = {23},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JGG_2019_23_2_JGG_2019_23_2_a9/}
}