TY  - GEN
TY  - GEN
T1  - Report
A2  - University of Helsinki
A2  - Observatory and Astrophysics Laboratory
LA  - eng
PP  - Helsinki
PB  - University of Helsinki
YR  - 1976
UL  - https://kansalliskirjasto.finna.fi/Record/fikka.3422658
ER  -