Proc Natl Acad Sci U S A. 1960 Jan;46(1):1-13.
DISTRIBUTION AND MOTION OF INTERSTELLAR HYDROGEN IN THE GALACTIC SYSTEM WITH PARTICULAR REFERENCE TO THE REGION WITHIN 3 KILOPARSECS OF THE CENTER.
Rougoor GW, Oort JH.
LEIDEN OBSERVATORY.
PMID: 16590580 [PubMed]
PMCID: 284997