Henrietta Leavitt's Paper on the Cepheid Variables in the Small Magellenic Cloud
Title: Periods of 25 Variable Stars in the Small Magellanic Cloud.
Authors: Leavitt, H. S. & Pickering, E. C.
Harvard Observatory Circular 173 (March 3, 1912), 1-3.
Source - NASA ADS





Edwin Hubble Paper on Cepheid Variables in M31 and M33
Title:
Cepheids in spiral nebulae
Authors:
Hubble, E. P.
Publication:
The Observatory, Vol. 48, p. 139-142 (1925)
Publication Date:
05/1925
Origin:
OBS
Bibliographic Code:
1925Obs....48..139H

Local Source