@article{10_2298_PIM0897015K,
     author = {Marko Kosti\'c},
     title = {Complex {Powers} of {Operators}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {15 },
     publisher = {mathdoc},
     volume = {_N_S_83},
     number = {97},
     year = {2008},
     doi = {10.2298/PIM0897015K},
     zbl = {1261.47024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/PIM0897015K/}
}