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2. Hinrichs, G. D. Programme der Atomechanik, oder die Chemie eine Mechanik der Panatome (Augustus Hagebock, 1867).
3. Fletcher, G. Murdock's Lies and the Representation of Information; available at <
http://www.spaceless.com/papers/4.htm
>.
4. The Alexander Arrangement of the Elements; available at <
http://www.scs-intl.com/alexander.htm
>.
5. Bradley, J.-C. Useful Chemistry <
http://usefulchem.blogspot.com/2007/10/3d-periodic-table-in-second-life.html
>.