Structure and stellar content of dwarf galaxies - III. B and R photometry of dwarf galaxies in the M 101 group and the nearby fieldT. Bremnes, B. Binggeli and P. PrugnielAstron. Astrophys. Suppl. Ser., 137 2 (1999) 337-350DOI: https://doi.org/10.1051/aas:1999486