@article{349156,
      author = {Porphyry, and Barnes, Jonathan,},
      url = {http://library.usi.edu/record/349156},
      title = {Porphyry Introduction /},
      publisher = {Oxford University Press,},
      recid = {349156},
      pages = {xxvi, 415 p. ;},
      address = {Oxford ;},
      year = {2003},
}