@article{CMFD_2006_16_a0,
     author = {V. P. Burskii and A. S. Zhedanov},
     title = {Boundary value problems for string equation, {Poncelet} problem, and {Pell--Abel} equation: links and relations},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {5--9},
     publisher = {mathdoc},
     volume = {16},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2006_16_a0/}
}