@article{10_4064_cm136_1_1,
     author = {Fernando Cobos and Oscar Dom{\'\i}nguez and Ant\'on Mart{\'\i}nez},
     title = {Compact operators and approximation spaces},
     journal = {Colloquium Mathematicum},
     pages = {1--11},
     publisher = {mathdoc},
     volume = {136},
     number = {1},
     year = {2014},
     doi = {10.4064/cm136-1-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm136-1-1/}
}