.. _data-sources:

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Data Sources
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Physical constants
    `NIST Physics Laboratory - Constants, units and uncertainty <http://physics.nist.gov/cuu/index.html>`_

Atomic and isotope mass
    `NIST Physics Laboratory - Atomic weights and isotope composition <http://physics.nist.gov/PhysRefData/Compositions/>`_

Atomic density
    ILL Neutron Data Booklet

Covalent Radii
    Cordero, et al., Dalton Trans., 2008, 2832-2838, `doi:10.1039/801115j <http://dx.doi.org/10.1039/b801115j>`_

Magnetic form factors
    Brown. P. J., In International Tables for Crystallography, Volume C, Wilson. A. J. C (ed), section 4.4.5

Neutron scattering factors
   `Atomic Institute for Austrian Universities <http://www.ati.ac.at/~neutropt/scattering/table.html>`_

X-ray scattering factors
   `Center for X-Ray Optics <http://www-cxro.lbl.gov/>`_

Crystal structure
    Ashcroft and Mermin

Oxidation states
    wikipedia: List of oxidation states of the elements

    Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.).
    Butterworth-Heinemann. pp. 27–28. ISBN 0-08-037941-9.

FASTA and biomolecule formulas
    Perkins, Modern Physical Methods in Biochemistry Part B, 143-265 (1988)