1. Anderson, P. W. Science 177, 393–396 (1972).
2. Steglich, F. et al. More is Different—Fifty Years of Condensed Matter Physics (Princeton Univ. Press, 2001).
3. Weisskopf, V. F. Brookhaven Nat. Lab. Publ. 24–27 https://nemenmanlab.org/~ilya/images/a/a4/Weisskopf-1965.pdf (1965).
4. Fortunato, S. et al. Science 359 (2018).