Cepheids as tracers of star formation in M 31 - I. Observations and identificationsE. A. Magnier, T. Augusteijn, S. Prins, J. van Paradijs and W. H.G. LewinAstron. Astrophys. Suppl. Ser., 126 3 (1997) 401-406DOI: https://doi.org/10.1051/aas:1997394