@article{PIM2_1989__46(60)_257843,
     author = {Joci\'c, Danko},
     title = {A characterization of formally symmetric unbounded operators.},
     journal = {Publications de l 'Institut Math\'ematique. Nouvelle S\'erie},
     pages = {141},
     publisher = {mathdoc},
     volume = {46(60)},
     year = {1989},
     zbl = {0701.47010},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/PIM2_1989__46(60)_257843/}
}