@article{10_4153_CMB_1974_119_0,
     author = {Faierman, M.},
     title = {Asymptotic {Formulae} for the {Eigenvalues} of a {Two} {Parameter} {System} of {Ordinary} {Differential} {Equations} of the {Second} {Order}},
     journal = {Canadian mathematical bulletin},
     pages = {657--665},
     year = {1975},
     volume = {17},
     number = {5},
     doi = {10.4153/CMB-1974-119-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-119-0/}
}