@article{10_21136_CMJ_1981_101724,
     author = {Jany\v{s}ka, Josef},
     title = {On linear functions on the sphere $S^2$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {75--82},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1981},
     doi = {10.21136/CMJ.1981.101724},
     mrnumber = {604113},
     zbl = {0466.58007},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1981.101724/}
}