@article{10_1017_S0017089500009563,
     author = {Browne, Patrick J. and Sleeman, B. D.},
     title = {A note on the characterisation of eigencurves for certain two parameter eigenvalue problems in ordinary differential equations},
     journal = {Glasgow mathematical journal},
     pages = {63--67},
     year = {1993},
     volume = {35},
     number = {1},
     doi = {10.1017/S0017089500009563},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009563/}
}