Gerd Kaupp 2022. Significant Effects of the Exponent 3/2 for Pyramidal and Conical Indentations: New Meanings of Physical Hardness and Modulus. Basic Mathematics for Physically Correct Mechanical Properties from Indentations. (Oct. 2022), 8–22. DOI:https://doi.org/10.9734/bpi/mono/978-93-5547-921-1/CH2.