@article{EJDE_2011__2011__a85,
     author = {Ismailov,  Zameddin I. and Otkun Cevik,  Elif and Unluyol,  Erdal},
     title = {Compact inverses of multipoint normal differential operators for first order},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1233.47037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a85/}
}