1. Alexandrova, E. E. : Oftal. Zh. 23, 522–524 (1968)
2. Alexandrova, E. E. : Ophthal. Lit. 22, 4172 (1969)
3. Aliquo-Mazzei, A. : Friuli med. 23, 297–301 (1968)
4. Aliquo-Mazzei, A. : Ophthal. Lit. 22, 4161 (1969)
5. Armstrong, J. R., Daily, R. K., Dobson, H. L., Girard, L. J. : Amer. J. Ophthal. 50, 55–63 (1960)