@article{RIUMI_2015_1_8_1_a0,
     author = {Lhotka, Christoph},
     title = {Sitnikov's {Planet}},
     journal = {La Matematica nella societ\`a e nella cultura},
     pages = {1--31},
     publisher = {mathdoc},
     volume = {Ser. 1, 8},
     number = {1},
     year = {2015},
     mrnumber = {3364898},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RIUMI_2015_1_8_1_a0/}
}