@article{PIM2_1997__61(75)_258027,
     author = {\v{Z}ivkovi\'c, Sne\v{z}ana},
     title = {Semi-Fredholm operators and perturbations.},
     journal = {Publications de l 'Institut Math\'ematique. Nouvelle S\'erie},
     pages = {73},
     publisher = {mathdoc},
     volume = {61(75)},
     year = {1997},
     zbl = {0889.47003},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/PIM2_1997__61(75)_258027/}
}