1. F. F. Lange, “Fracture Toughness of Si3N4 as a Function of the Initial α-Phase Content,” J. Am. Ceram. Soc. 62 (7–8) 428–30 (1979).
2. G. Himsolt, H. Knoch, H. Huebner, and F. W. Kleinlein, “Mechanical Properties of Hot-Pressed Silicon Nitride with Different Grain Structures,” J. Am. Ceram. Soc., 62(1) 29–32 (1979).
3. T. Kawashima, H. Okamoto, H. Yamamoto, and A. Kitamura, “Grain Size Dependence of the Fracture Toughness of Silicon Nitride Ceramics,” J. Ceram. Soc. Japan, 99: 1–4, (1991).
4. H. Okamoto, H. Yamamoto, and A. Kitamura ibid, “Characteristics of a Variety of Silicon Nitrides Based on Microstructural Control,” pp. 135–46 in Silicon Nitride Ceramics 2, M. Mitomo and S. Somiya (eds), Uchida Rokakuho Publishing Co., Ltd., Tokyo 1990.
5. M. Mitomo, “Toughening of Silicon Nitride Ceramics by Microstructural Control,” pp. 101–07 in Proc. Sci. Eng’g Ceram., S. Kimura & K. Niihara, eds., Ceram. Soc. Jpn, Tokyo, 1991.