@article{RM_2010_65_2_a2,
     author = {V. Dragovi\'c and M. Radnovi\'c},
     title = {Integrable billiards and quadrics},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {319--379},
     year = {2010},
     volume = {65},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2010_65_2_a2/}
}