1. [1] Watanabe, T., “Present Status of Powder Metallurgy in Japan,” Int. J. Powder Metall. Powder Technol., 16, 3, 1980, 249-253.
2. [2] Watanabe, T., “Porous Sintered Bearings,” J. Jpn. Soc. Powder Powder Metall., 48, 9, 2001, 769-776 (in Japanese).
3. [3] Tanabe, S., “Energy Saving and Tribology in Impregnated Sintered Bearings,” J. Jpn. Soc. Tribol., 51, 5, 2006, 353-358 (in Japanese).
4. [4] Kaneko, S., “Porous Oil Bearings,” J. Jpn. Soc. Tribol., 38, 9, 1993, 773-778 (in Japanese).
5. [5] Quan, Y.-X., Ma, J., Tian, Y.-G., Zhou, G.-R., Shi, G.-Y. and Wang, G.-L., “Investigation of Sintered Bronze Bearings Under High-Speed Conditions,” Tribol. Int., 18, 2, 1985, 75-80.