Classes of small-world networks

L. A. N. Amaral*, A. Scala, M. Barthe ́ le ́ my†, and H. E. Stanley Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215 Communicated by Herman Z. Cummins, City College of the City University of New York, New York, NY, July 13, 2000 (received for review April 20, 2000)