@article{TAM_2020_47_2_a8,
     author = {Vladimir Dragovi\'c and Borislav Gaji\'c and Bo\v{z}idar Jovanovi\'c},
     title = {Demchenko's nonholonomic case of a gyroscopic ball rolling without sliding over a sphere after his 1923 {Belgrade} doctoral thesis},
     journal = {Theoretical and applied mechanics},
     pages = {257 - 287},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {2020},
     url = {http://geodesic.mathdoc.fr/item/TAM_2020_47_2_a8/}
}