1. “An Introduction to Econophysics”, Cambridge University Press, Cambridge, UK 2000, p. 2.
2. “An Introduction to Probability Theory and Its Applications”, Volume II, Wiley, New York 1971.
3. “The Fractal Geometry of Nature”, Freeman, New York 1983.
4. “Linked: The New Science of Networks”, Perseus Press, Cambridge, MA 2002.
5. Localization of Electromagnetic Waves in Three-Dimensional Fractal Cavities