Gerd Kaupp. (2022). The Physical Foundation of F\(_{N}\)=kh\(^{(3/2)}\) for Conical/Pyramidal Indentation Loading Curves: Scientific Explanation . Basic Mathematics for Physically Correct Mechanical Properties from Indentations, 3–7. https://doi.org/10.9734/bpi/mono/978-93-5547-921-1/CH1