@article{10_4064_sm_51_3_201_223,
     author = {Albrecht Pietsch},
     title = {s-Numbers of operators in {Banach} spaces},
     journal = {Studia Mathematica},
     pages = {201--223},
     publisher = {mathdoc},
     volume = {51},
     number = {3},
     year = {1974},
     doi = {10.4064/sm-51-3-201-223},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-51-3-201-223/}
}