@article{BASS_2004_29_1_a2,
     author = {J. Jaro\v{s} and T. Kusano},
     title = {Self-adjoint differential equations and generalized {Karamata} functions},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {25 - 60},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {2004},
     zbl = {1091.34521},
     url = {http://geodesic.mathdoc.fr/item/BASS_2004_29_1_a2/}
}