The Microhardness of Enamel and Dentin

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Knoop, F. , Peters, C.G. , and Emerson, W.B. : Sensitive Pyramidal Diamond Tool for Indentation Measurements, Nat'l. Bureau Standards, Journal of Research 23: 39, 1939.

Sweeney, W.T. : The Knoop Indentation Hardness Instrument as a Tool in Dental Research, J. D. Res. 21: 303, 1942.

Richardson, J.F. , and Warner, H.K. : A Micro-Hardness Instrument for Studying Surface Hardness, Austral. J. Den. 49: 217, 1945.