Autore:Oskar Backlund
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Oskar_Backlund.jpg/140px-Oskar_Backlund.jpg)
- ↑ 1,0 1,1 data.bnf.fr
- ↑ 2,0 2,1 Svenskt biografiskt lexikon
- ↑ Swedish church birth records
- ↑ 4,0 4,1 annuaire prosopographique: la France savante
- ↑ Biographical Database of Southern African Science
Backlund XIX secolo/XX secolo astronomo svedese