Geodesic
Markov and Lagrange spectra (survey of the literature)
Zapiski Nauchnykh Seminarov POMI, Studies in number theory. Part 4, Tome 67 (1977), pp. 5-38

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A survey is given of investigations on the Markov problem of the arithmetic minima of indeterminate, binary, quadratic forms and on the Lagrange–Hurwitz problem of Diophantine approximations of irrational numbers by rational numbers. 
@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/}
}
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A. V. Malyshev. Markov and Lagrange spectra (survey of the literature). Zapiski Nauchnykh Seminarov POMI, Studies in number theory. Part 4, Tome 67 (1977), pp. 5-38. http://geodesic.mathdoc.fr/item/ZNSL_1977_67_a0/