A. N. Gent (1958), On the relation between indentation hardness and Young's modulus, Institution of Rubber Industry -- Transactions, 34, pp. 46–57. doi:10.5254/1.3542351
A. W. Mix and A. J. Giacomin (2011), Standardized Polymer Durometry, Journal of Testing and Evaluation, 39(4), pp. 1–10. doi:10.1520/JTE103205
Qi, H. J., Joyce, K., Boyce, M. C. (2003), Durometer hardness and the stress-strain behavior of elastomeric materials, Rubber Chemistry and Technology, 76(2), pp. 419–435. doi:10.5254/1.3547752