Stringent bounds to spatial variations of the electron-to-proton mass ratio in the Milky Way (2009)
Molaro, Paolo, Levshakov, Sergei A., Kozlov, MiKhail G.
The ammonia method to probe variations of the electron-to-proton mass ratio, Delta_mu/mu, is applied for the first time to dense prestellar molecular clouds in the Milky Way. Carefully selected...