1. The arrangement of cells in a net
2. Fullman , R. L. 1952. Metal Interfaces, 179Cleveland, Ohio: American Society for Metals.
3. Shape Distribution of Two‐Dimensional Soap Froths
4. Smith , C. S. 1952. Metal Interfaces, 65Cleveland, Ohio: American Society for Metals. 1981,A Search for Structure(Cambridge, Mass.: MIT Press), p. 1