@article{PIM_1989_N_S_46_60_a19,
     author = {Danko Joci\'c},
     title = {A {Characterization} of {Formally} {Symmetric} {Unbounded} {Operators}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {141 },
     publisher = {mathdoc},
     volume = {_N_S_46},
     number = {60},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1989_N_S_46_60_a19/}
}