Journal Article
                        
                        Chiba, Yasuo, Aiqiang  Xu, LI  Li, T  Lei, Toshiro  Takezaki, Akio  Hagiwara, Tetsuo  Yoneyama, Takashi  Fujiwara, Minoru  Hara, and Teiji  Yamamoto.  
"Poliomyelitis surveillance in Shandong province, China, 1990-92.." Bulletin of the World Health Organization 72, no. 6 (1994): 915-920.