1. Lectures on elliptic boundary value problems;Agmon,1965
2. Distribution of modes in fractal resonators;Berry,1979
3. M. V. BerrySome geometric aspects of wave motion: wavefront dislocations, diffraction catastrophes, diffractals, Geometry of the Laplace operator, Proc. Symp. Pure Math., Vol 36, Amer. Math. Soc., Providence, 1980, p. 13–38.
4. On the complementary intervals of a linear closed set of zero Lebesgue measure;Besicovich;J. London Math. Soc.,1954
5. Ensembles impropres et nombre dimensionnel;Bouligand;Bull. Sci. Math. (2),1928