@book{Penrose89,
  title = {The emperor's new mind - concerning computers, minds and the laws of physics},
  author = {Roger Penrose},
  year = {1989},
  url = {http://www.worldcat.org/oclc/19724273},
  researchr = {https://researchr.org/publication/Penrose89},
  cites = {0},
  citedby = {0},
  publisher = {Oxford Univ. Press},
  isbn = {0198519737},
}