F. Axel/J. Peyriere: [ ... ]
CRAS 306 (1988), 179-182.

F.Axel a.o.: Vibrational models in a one-dimensional quasi-alloy, the Morse 
case. J. Phys. C3:47 (1987), 181-187.

Jean Bellissard/R. Rammal: An algebraic semiclassical approach to Bloch 
electrons in a magnetic field. J. Phys. France 51 (1990), 1803-1830.

Jean Bellissard/A. Bovier/J. Ghez: Spectral properties of a tight binding 
hamiltonian with period doubling potential. 
Comm. Math. Phys. 135 (1991), 379-399.

N. de Bruijn: Sequences of zeroes and ones generated by special production 
rules. Kon. Nederl. Ak. Wetensch. A 84 (1981), 27-37.

F. Delyon/J. Peyriere: Recurrence of the eigenstates of a Schroedinger 
operator with automatic potential. J. Stat. Phys. 64 (1991), 363-368.

D. Hofstadter: Energy levels and wave functions of Bloch electrons in a 
rational or irrational magnetic field. Phys. Rev. B 14 (1976), 2239.

L. Kadanoff/M. Kohmoto/C. Tang: Localization problem in one dimension: 
Mapping and escape. Phys. Rev. Lett. 50 (1983), 1870-1872.

M. Kohmoto/Y. Oono: Cantor spectrum for an almost periodic Schroedinger 
operator and a dynamical map. Phys. Lett. 102 A (1984), 145-148.

Jena-Marc Luck: Cantor spectra and scaling of gap widths in deterministic 
aperiodic systems. Phys. Rev. B 39 (1989), 5834-5849.

S. Ostlund/S. Kim: Renormalization of quasiperiodic mappings. 
Physica Scripta 9 (1985), 193-198.

R. Rammal: Spectrum of harmonic excitations on fractals.
J. de Phys. 45 (1984), 191-206.

M. Rieffel: C*-algebras associated with irrational rotations.
Pacific J. Math. 95 (1981), 415-419.