1. Suzanne Bernard © 1999, http://phd.evansville.edu/fr/tetra_4/republic/caverne.htm, April 11th 1999, last version April 25th 1999, and http://www.perseus.tufts.edu
2. Organic Molecular Crystals: their Electronic States;Silinsh,1980
3. Molecular Semiconductors;Simon,1985
4. Metallophthalocyanines