1. 1) Y. Ozaki: “1-4 Ultrafine zirconia powder”, Zirconia Ceramics, 1, 31-44, Uchidarokakuho, Tokyo 1985.
2. 2) M. Tokita: “Trend in Advanced SPS Spark Plasma System and Technology”, J. Soc. Powder Tech. Jpn., 30 (1993) 790-804.
3. 3) S. Grasso, Y. Sakka, G. Maizza: “Electric current activated/assisted sintering (ECAS): a review of patents 1906-2008”, Sci. Tech. Adv. Mater., 10 (2009) 053001.
4. 4) R. Orru, R. Licheri, L. Antonio Mario, C. Alberto, C. Giacomo: “Consolidation/synthesis of materials by electric current activated/assisted sintering”, Mater. Sci. Eng. R., 63 (2009) 127-287.
5. 5) K. Shibaya, H. Sato, H. Matsuda, K. Takaoka, M. Kato, K. Hirota, H. Taguchi: “Fabrication of ZrO2 Solid Solution Ceramics Containing Al2O3 Having High Bending Strength (σb ≥ 1 GPa) and High Fracture Toughness (KIC ≥ 20 MPa • m1/2) Simultaneously by Pulsed Electric-current Pressure Sintering (PECPS)”, J. Jpn. Soc. Powder Powder Metall., 58 (2012) 727-732.