سختی عناصر (صفحه اطلاعات) (Persian Wikipedia)

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Hardness can vary by several hundred percent depending on the pretreatment, see e.g. Iron#Mechanical_properties and Angelo Basile; Fausto Gallucci (19 April 2011). Membranes for Membrane Reactors: Preparation, Optimization and Selection. John Wiley & Sons. pp. 30–. ISBN 978-0-470-74652-3. Retrieved 7 January 2012.
John Harris; Walter Benenson; Horst Stöcker (2002). Handbook of physics. Springer. p. 240. ISBN 978-0-387-95269-7. Retrieved 7 January 2012.

As quoted at http://www.webelements.com/ from G.V. Samsonov (Ed.) in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA, 1968