2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/2774We describe the monitoring program we have been carrying out during the past 10 years on a sample of late-type stars, with the Medicina 32-m and Effelsberg 100-m antennas. We discuss the observations on the Mira-variable R Cas in some detail.4 pages, to be published in IAU Symp. 206: "Cosmic masers: From protostars to black holes" (Eds. V. Migenes, E. Luedke)Astrophysicstext