@article{MOMA_1977__84_177830,
     author = {Mary E. Gbur},
     title = {Accumulation {Points} of the {Lagrange} and {Markov} {Spectra.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {91--108},
     publisher = {mathdoc},
     volume = {84},
     year = {1977},
     zbl = {0372.10019},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1977__84_177830/}
}