@article{VMUMM_2019_3_a12,
     author = {V. A. Proshkin},
     title = {An extremal property of orbits in the {Solar} system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {75--79},
     publisher = {mathdoc},
     number = {3},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2019_3_a12/}
}