@article{SM_2002_193_1_a0,
     author = {A. I. Aptekarev},
     title = {Sharp constants for rational approximations of analytic functions},
     journal = {Sbornik. Mathematics},
     pages = {1--72},
     publisher = {mathdoc},
     volume = {193},
     number = {1},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_1_a0/}
}