@article{64317,
      author = {Courant, Richard, and Hilbert, David,},
      url = {http://library.usi.edu/record/64317},
      title = {Methods of mathematical physics,},
      publisher = {Interscience Publishers,},
      recid = {64317},
      pages = {2 v.},
      address = {New York,},
      year = {1953},
}