@article{EJDE_2000__2000__a115,
     author = {Kaufmann,  Eric R.},
     title = {Smoothness of solutions of conjugate boundary-value problems on a measure chain},
     journal = {Electronic journal of differential equations},
     year = {2000},
     volume = {2000},
     zbl = {0952.34025},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a115/}
}