@article{EJDE_2012__2012__a84,
     author = {Ismailov,  Zameddin I. and Mert,  Rukiye Ozturk},
     title = {Normal extensions of a singular multipoint differential operator of first order},
     journal = {Electronic journal of differential equations},
     year = {2012},
     volume = {2012},
     zbl = {1238.47027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a84/}
}