Water vapour masers in long-period variable stars: II. The semi-regular variables R Crt and RT Vir Brand, J. Engels, D. Winnberg, A. 2020 - Forschungsinformationssystem der UHH
Water vapour masers in the mira variable U herculis Winnberg, A. Brand, J. Engels, Dieter 2011 - Forschungsinformationssystem der UHH