@article{10_4064_sm218_2_1,
     author = {K. Kumar and M. N. N. Namboodiri and S. Serra-Capizzano},
     title = {Preconditioners and {Korovkin-type} theorems
 for infinite-dimensional bounded linear operators
 via completely positive maps},
     journal = {Studia Mathematica},
     pages = {95--118},
     publisher = {mathdoc},
     volume = {218},
     number = {2},
     year = {2013},
     doi = {10.4064/sm218-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm218-2-1/}
}