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[6] https://en.wikipedia.org/wiki/X-ray_crystallography
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http://dx.doi.org/10.4236/ojpc.2014.42010
[8] Auvert, G. (2014) Improvement of the Lewis-Abegg-Octet Rule Using an “Even-Odd” Rule in Chemical Structural Formulas: Application to Hypo and Hyper-Valences of Stable Uncharged Gaseous Single-Bonded Molecules with Main Group Elements. Open Journal of Physical Chemistry, 4, 60-66.
http://dx.doi.org/10.4236/ojpc.2014.42009
[9] Auvert, G. (2014) The Even-Odd Rule on Single Covalent-Bonded Structural Formulas as a Modification of Classical Structural Formulas of Multiple-Bonded Ions and Molecules. Open Journal of Physical Chemistry, 4, 173-184.
http://dx.doi.org/10.4236/ojpc.2014.44020
[10] Mendelejew, D. (1869) über die Beziehungen der Eigenschaften zu den Atomgewichten der Elemente. Zeitschrift für Chemie (in German), 405-406.
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[14] http://www.gimp.org/downloads/
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[16] Haynes, W., Ed. Handbook of Chemistry and Physics. CRC 96th Edition.
[17] Hatert, F. Compléments de cristallographie www.minera.ulg.ac.be/pdf/