Hofstadter, D. R. (1982). «Who shoves whom around inside the careenium? Or what is the meaning of the word ?I??». Synthese. 53: 189–218. doi:10.1007/BF00484897
Hofstadter, Douglas (1976). «Energy levels and wave functions of Bloch electrons in rational and irrational magnetic fields». Physical Review B. 14: 2239–2249. Bibcode:1976PhRvB..14.2239H. doi:10.1103/PhysRevB.14.2239
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Hofstadter, Douglas (1976). «Energy levels and wave functions of Bloch electrons in rational and irrational magnetic fields». Physical Review B. 14: 2239–2249. Bibcode:1976PhRvB..14.2239H. doi:10.1103/PhysRevB.14.2239