SEARCH Articles Figures Tables Band structure of insulators, semiconductors and metals Band theory of metals and insulators Bonding in Solids Metals, Insulators, and Semiconductors Insulators, Semiconductors and Metals On the Size-Induced Metal-Insulator Transition in Clusters and Small Particles Percolation, Gelation and the Metal-Insulator Transition Polymers versus Metals and Insulators Pseudogaps and metal-insulator transitions The metal-insulator transition in mesoscopic and macroscopic systems