1. Isakson et al. (1982); Noma et al. (1986)
2. Cory et al. (1980); Davis et al. (1980); Dunnick et al. (1980); Kataoka et al. (1980); Maki et al. (1980)
3. Kinoshita et al. (1998); Petry et al. (1999)
4. Kinoshita et al. (1998)
5. Stavnezer-Nordgren and Sirlin (1986);