Report on the observation of iron dust
A statistical study of pulsating stars. Fourteenth paper: Irregular variables in & Cen
A statistical study of pulsating stars. First paper: The variable stars in a Centauri
A statistical study of pulsating stars.Fifth paper: The variables stars in M 53 and N.G.C. 3201
A statistical study of pulsating stars.Fourth paper: The variables in Messier 3