Geodesic
Total angle about the vertex of a cone in Galilean space
Matematičeskie zametki, Tome 43 (1988) no. 5, pp. 657-662 
A. Artykbaev. Total angle about the vertex of a cone in Galilean space. Matematičeskie zametki, Tome 43 (1988) no. 5, pp. 657-662. http://geodesic.mathdoc.fr/item/MZM_1988_43_5_a8/
@article{MZM_1988_43_5_a8,
     author = {A. Artykbaev},
     title = {Total angle about the vertex of a cone in {Galilean} space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {657--662},
     year = {1988},
     volume = {43},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_43_5_a8/}
}
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