@article{10_4064_sm153_1_3,
     author = {Taneli Huuskonen and Jussi V\"a{\i}s\"al\"a},
     title = {Hyers{\textendash}Ulam constants of {Hilbert} spaces},
     journal = {Studia Mathematica},
     pages = {31--40},
     publisher = {mathdoc},
     volume = {153},
     number = {1},
     year = {2002},
     doi = {10.4064/sm153-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm153-1-3/}
}