@article{10_2298_TAM160304008S,
     author = {Yuri B. Suris},
     title = {Billiards in confocal quadrics as a {pluri-Lagrangian} system},
     journal = {Theoretical and applied mechanics},
     pages = {221 },
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {2016},
     doi = {10.2298/TAM160304008S},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/TAM160304008S/}
}