G.S. Shostak, P.C. van der Kruit, E. Hummel, P.A. Shaver, J.M. van der Hulst, Astronomy and Astrophysics, 115, 293, 1982.
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Studies of Nearly Face-On Spiral Galaxies. I. The Velocity Dispersion of the HI Gas in NGC 3938→
/P.C. van der Kruit and G.S. Shostak, Astronomy and Astrophysics, 105, 351, 1982.
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