@article{ZNSL_1977_67_a0,
     author = {A. V. Malyshev},
     title = {Markov and {Lagrange} spectra (survey of the literature)},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--38},
     publisher = {mathdoc},
     volume = {67},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_67_a0/}
}