On structural properties of open galactic clusters and their spatial distribution : with an appendix containing a catalogue of 471 objects - Collinder, Per; Lunds universitet (Lund : Nya Boktryckeriet, 1931)
Disertace--Lunds universitet, 1931.
Keywords: cluster of galaxies; kupa galaxií; otevřené hvězdokupy; paralaxa; disertace