@article{10_4153_CMB_2014_029_4,
     author = {Zamani, Ali and Moslehian, Mohammad Sal},
     title = {Exact and {Approximate} {Operator} {Parallelism}},
     journal = {Canadian mathematical bulletin},
     pages = {207--224},
     year = {2015},
     volume = {58},
     number = {1},
     doi = {10.4153/CMB-2014-029-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2014-029-4/}
}