E. Churchwell, A. Witzel, W. Huchtmeier, I. Pauliny-Toth, J. Roland, and W. Sieber,
Detection of H<sub>2</sub>O maser emission in the Galaxy M 33,
Astron. Astrophys. 54, 969-971 (1977).
Source(s): M33
Facility: Effelsberg 100m
Contributor(s): S. Thorwirth, 07/2005