@article{ND_2018_14_4_a9,
     author = {A. V. Podobryaev},
     title = {Antipodal {Points} and {Diameter} of a {Sphere}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {579--581},
     publisher = {mathdoc},
     volume = {14},
     number = {4},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2018_14_4_a9/}
}