@article{JGG_2019_23_2_JGG_2019_23_2_a0,
     author = {G. Glaeser and B. Odehnal and H. Stachel },
     title = {A {Spatial} {Version} of the {Theorem} of the {Angle} of {Circumference}},
     journal = {Journal for geometry and graphics},
     pages = {147--156},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {2019},
     url = {http://geodesic.mathdoc.fr/item/JGG_2019_23_2_JGG_2019_23_2_a0/}
}