https://www.universetoday.com/articles/m31s-odd-rotation-curve
M31's Odd Rotation Curve - Universe Today
rotation curvem31odduniversetoday
https://arxiv.org/abs/1503.07273
[1503.07273] Outer Rotation Curve of the Galaxy with VERA II: Annual Parallax and Proper Motion of...
Abstract page for arXiv paper 1503.07273: Outer Rotation Curve of the Galaxy with VERA II: Annual Parallax and Proper Motion of the Star-Forming Region...
https://arxiv.org/abs/astro-ph/9506004
[astro-ph/9506004] The Universal Rotation Curve of Spiral Galaxies: I. the Dark Matter Connection
Abstract page for arXiv paper astro-ph/9506004: The Universal Rotation Curve of Spiral Galaxies: I. the Dark Matter Connection