http://www.chem.qmul.ac.uk/surfaces/scc/scat5_2.htm

http://144.206.159.178/ft/162/51659/14348832.pdf

http://www.scm.com/Doc/Doc2012/ADF/ADFUsersGuide/page153.html

http://www.scm.com/Doc/Doc2012/ADF/Examples/page55.html

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