Brinell, J.-A.Memoire sur les epreuves à bille en acier, Communications presentés devant le congrès international des methodes d'essai des matériaux de construction, 2:83-94, 1901.
3.
Smith, R., and Sandland, G.Some Notes on the Use of a Diamond Pyramid for Hardness Testing, J. Iron Steel Inst., 111:285, 1925.
4.
Meyer, E.Untersuchungen über Härteprüfung und Harte, Z. Ver. deut. Ing., 52:645, 740, 835, 1908.
5.
Onitsch, E.M.Über die Mikroharte der Metalle, Mikroskopie, 2:131, 1947.
6.
Vitovec, F.Uber den Einfluss und Kaltverformung auf die Mikroharte, Berg- u.hüttenmänn. Monatsh. montan. Hochschule Leoben, 96:133, 1951.
7.
Bückle, H.Untersuchungen über die Lastabhangigkeit der Vikers-Mikroharte, Z. Metallk., 45:623, 1954.
8.
Tuchschmid, H.E.Untersuchungen der Kristallgrenzen in verformten Metallen, insobesondere durch Mikrohartemessungen, Schweiz. Arch. angew. Wiss. u. Tech., 20:382, 1954.
9.
Richardson, J.F., and Worner, H.K.A Micro-hardness Instrument for Studying Surface Hardness, Austral. J. D., 49:217, 1945.
10.
Hodge, H.C.Hardness Tests on Teeth, J. D. Res., 15:271, 1936.
11.
Knoop, F., Peters, C.G., and Emerson, W.B.A Sensitive Pyramidal-Diamond Tool for Indentation Measurements, J. Research Nat. Bur. Standards, 23:39, 1939.
12.
Souder, W., and Schoonover , 1. C. ExperimentalRemineralization of Dentin, J.A.D.A., 31:1597, 1944.
13.
Gustafson, G., and Kling, O.Micro-Hardness Measurements in the Human Dental Enamel, Odont. Tskr., 56:23, 1948.
14.
Swartz , M.L., and Phillips , R.W.Solubility of Enamel on Areas of Known Hardness, J. D. Res., 31:293, 1952.
15.
Atkinson, H.F. , and Saunsbury, P.An Investigation into the Hardness of Human Enamel, Brit. D. J., 94:249,1953.
16.
Caldwell, R.C. , Muntz, M.L., Gilmore, R.W., and Pigman, W.Microhardness Studies of Intact Surface Enamel and Dentin, J. D. Res., 37:661, 1958.
17.
Craig, R.G., and Peyton, F.A.The Microhardness of Enamel and Dentin, J. D. Res., 37:661, 1958.
18.
Newbrun, E., Timberlake, P., and Pigman, W.Changes in Microhardness of Enamel Following Treatment with Lactate Buffer , J. D. Res., 38:293, 1959.
19.
Vitovec, F.H., and Binder, H.F.The Effect of Surface Preparation and Condition on Microhardness. WADC Technical Rept. 55-372, Wright Air Development Center, October, 1955.