TY  - BOOK
AU  - Burkhardt, G., ed.
AU  - Esser, U., ed.
AU  - Hefele, H., ed.  
TI  - Astronomy and astrophysics: vol. 52B
PY  - 1991///
CY  - Berlin
PB  - Springer-Verlag
KW  - Astronomy
KW  - Astrophysics
ER  -