1. Aslanov, L. A. (2014). 48th School on Condensed State Physics, Saint-Petersburg, Abstract of Lectures, p. 29. http://lns.pnpi.spb.ru/fks2014.
2. Bader, R. F. W. (1990). Atoms in Molecules - A Quantum Theory. Oxford University Press.
3. Barzaghi, M. (2005). PAMoC. Version 2005.0. Online User's Manual, CNR-ISTM, Institute of Molecular Science and Technologies, Milan, Italy. http://web.istm.cnr.it/~barz/pamoc/index.html.
4. VALTOPO: a program for the determination of atomic and molecular properties from experimental electron densities
5. Molecular Model with Quantum Mechanical Bonding Information