The Solar Surface Differential Rotation from Disk-Integrated Chromospheric FluxesDOI: info:10.1007/BF00733031v. 15953–62
Donahue, Robert A. and Keil, Steven L. 1995. "The Solar Surface Differential Rotation from Disk-Integrated Chromospheric Fluxes." Solar Physics, 159 53–62. https://doi.org/10.1007/BF00733031.