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http://en.wikipedia.org/wiki/Metallic_bonding
http://simple.wikipedia.org/wiki/Metallic_bond
http://www.chemguide.co.uk/atoms/bonding/metallic.html
http://chemwiki.ucdavis.edu/Theoretical_Chemistry/Chemical_Bonding/Gener...
http://faculty.pingry.org/dburns/chemistry/documents/MetallicBonding.pdf
http://depts.washington.edu/chemcrs/bulkdisk/chem162A_sum06/handout_Lect...
http://www.physics.usyd.edu.au/~stampfl/lec-6.pdf
http://www.smallscalechemistry.colostate.edu/PowerfulPictures/ChemicalBo...
http://mineral.gly.bris.ac.uk/Chemistry/pdflectures/CovalentBonding.pdf
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