1. Lennert 1967, 1969.
2. Gérard-Marchant et al. 1974; Lennert et al. 1975; Lennert 1976.
3. 1974a, b, 1975a, b; Collins et al. 1976; Lukes et al. 1978a.
4. Gérard-Marchant 1974a, b; Robb-Smith 1975; Dühmke 1976; Sandritter and Grimm 1977; Becker 1978; Fischer 1978; Heimann et al. 1978; Kelényi 1978; Georgii et al. 1979; Vanden Heule et al. 1979; Shtern 1980.
5. Musshoff et al. 1976; Bremer et al. 1977; Brittinger et al. 1977, 1978; Mandard et al. 1977; Braun-Falco et al. 1978; Delbrück et al. 1978; Garwicz et al. 1978; Machado et al. 1978; Meugé et al. 1978; Takácsi-Nagy et al. 1978; Diehl et al. 1979; Musshoff 1979; Glimelius et al. 1983; Porwit-Ksiazek and Mioduszewska 1983; Leonard et al. 1983; Lieberman et al. 1986.