@article{JGG_2020_24_2_JGG_2020_24_2_a5,
     author = {G. A. Notowidigdo },
     title = {A {Rational} {Trigonometric} {Relationship} {Between} the {Dihedral} {Angles} of a {Tetrahedron} and its {Circumradius}},
     journal = {Journal for geometry and graphics},
     pages = {207--216},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {2020},
     url = {http://geodesic.mathdoc.fr/item/JGG_2020_24_2_JGG_2020_24_2_a5/}
}