@article{10_4064_sm149_1_3,
     author = {Piotr Niemiec},
     title = {Separate and joint similarity to families
of normal operators},
     journal = {Studia Mathematica},
     pages = {39--62},
     publisher = {mathdoc},
     volume = {149},
     number = {1},
     year = {2002},
     doi = {10.4064/sm149-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm149-1-3/}
}