Testing the variability of the proton-to-electron mass ratio from observations of methanol in the dark cloud core L1498. - Daprà, M.; Henkel, C.; Levshakov, S. A.; Menten, K. M.; Muller, S.; Bethlem, H. L.; Leurini, S.; Lapinov, A. V.; Ubachs, W. (Monthly Notices of the Royal Astronomical Society, 2017)