@article{10_4064_sm159_3_4,
     author = {Bernd Carl and David E. Edmunds},
     title = {Gelfand numbers and metric entropy of
 convex hulls in {Hilbert} spaces},
     journal = {Studia Mathematica},
     pages = {391--402},
     publisher = {mathdoc},
     volume = {159},
     number = {3},
     year = {2003},
     doi = {10.4064/sm159-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm159-3-4/}
}