@article{MZ_1957__68_169693,
     author = {F.V. Atkinson},
     title = {Estimation of an {Eigen-Value} {Occurring} in a {Stability} {Problem.}},
     journal = {Mathematische Zeitschrift},
     pages = {82--99},
     publisher = {mathdoc},
     volume = {68},
     year = {1957},
     zbl = {0078.07503},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__68_169693/}
}