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Published online by Cambridge University Press: 04 August 2017
The spiral galaxy M33 has been observed at several frequencies from the ultraviolet to the radio regions. The observations at 2030 A have been presented by Milliard (1984); the radio data obtained with the WSRT and the VLA are presented and analyzed in a series of papers (Viallefond and Goss 1986, and references therein).