@article{JGG_2021_25_2_JGG_2021_25_2_a7,
     author = {H. Katsuura },
     title = {Angles of {Isosceles} {Tetrahedra}},
     journal = {Journal for geometry and graphics},
     pages = {243--251},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {2021},
     url = {http://geodesic.mathdoc.fr/item/JGG_2021_25_2_JGG_2021_25_2_a7/}
}