@article{10_4064_sm145_2_2,
     author = {Olavi Nevanlinna},
     title = {Resolvent conditions and powers of operators},
     journal = {Studia Mathematica},
     pages = {113--134},
     publisher = {mathdoc},
     volume = {145},
     number = {2},
     year = {2001},
     doi = {10.4064/sm145-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm145-2-2/}
}