@article{63117,
      note = {Abridged text of v. 1 of Principia mathematica.},
      author = {Whitehead, Alfred North, and Russell, Bertrand,},
      url = {http://library.usi.edu/record/63117},
      title = {Principia mathematica : to *56,},
      publisher = {University Press,},
      recid = {63117},
      pages = {410 p.},
      address = {Cambridge [Eng.]},
      year = {1962},
}