Penrose, Roger; Mermin, N. David (December 1990). "The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics". American Journal of Physics. 58 (12): 1214–1216. Bibcode:1990AmJPh..58.1214P. doi:10.1119/1.16207. ISSN0002-9505.
Penrose, Roger (1998-08-15). "Quantum computation, entanglement and state reduction". Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences. 356 (1743): 1927–1939. Bibcode:1998RSPTA.356.1927P. doi:10.1098/rsta.1998.0256. ISSN1364-503X. S2CID83378847.
Penrose, Roger; Mermin, N. David (December 1990). "The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics". American Journal of Physics. 58 (12): 1214–1216. Bibcode:1990AmJPh..58.1214P. doi:10.1119/1.16207. ISSN0002-9505.
Penrose, Roger (1998-08-15). "Quantum computation, entanglement and state reduction". Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences. 356 (1743): 1927–1939. Bibcode:1998RSPTA.356.1927P. doi:10.1098/rsta.1998.0256. ISSN1364-503X. S2CID83378847.
Penrose, Roger (1998-08-15). "Quantum computation, entanglement and state reduction". Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences. 356 (1743): 1927–1939. Bibcode:1998RSPTA.356.1927P. doi:10.1098/rsta.1998.0256. ISSN1364-503X. S2CID83378847.
Penrose, Roger; Mermin, N. David (December 1990). "The Emperor's New Mind: Concerning Computers, Minds, and the Laws of Physics". American Journal of Physics. 58 (12): 1214–1216. Bibcode:1990AmJPh..58.1214P. doi:10.1119/1.16207. ISSN0002-9505.
Penrose, Roger, author. (31 March 2016). The Road To Reality : a Complete Guide to the Laws of the Universe. Random House. ISBN978-1-4464-1820-8. OCLC959367695. {{cite book}}: |last= has generic name (help)CS1 maint: multiple names: authors list (link)
Penrose, Roger (1998-08-15). "Quantum computation, entanglement and state reduction". Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences. 356 (1743): 1927–1939. Bibcode:1998RSPTA.356.1927P. doi:10.1098/rsta.1998.0256. ISSN1364-503X. S2CID83378847.