@article{MZM_1968_3_2_a9,
     author = {G. A. Freiman},
     title = {Noncoincidence of the {Markov} and {Lagrange} spectra},
     journal = {Matemati\v{c}eskie zametki},
     pages = {195--200},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_2_a9/}
}