@article{MAN_1963__149_161032,
     author = {W.N. EVERITT},
     title = {Fourth {Order} {Singular} {Differential} {Equations.}},
     journal = {Mathematische Annalen},
     pages = {320--340},
     publisher = {mathdoc},
     volume = {149},
     year = {1963},
     zbl = {0111.08501},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__149_161032/}
}