1. Hardness and Flow Properties of Gypsum Materials;Mahler;J. Pros. Den.,1951
2. Surface Hardness, Compressive Strength, and Abrasion Resistance of Indirect Die Stones;Peyton;J. Pros. Den.,1952
3. Some Experiments on the Surface Hardness of Dental Stones;Skinner;J. Pros. Den.,1956
4. Dimensional, Form, and Hardness Changes of Dies for Indirect Dental Technic;Fusayama;J.A.D.A.,1956
5. Indentation Hardness and Elasticity;Axelsson;Odont. Revy,1958