A census of AGB stars in Local Group galaxies - I. Photometry of a field in M 31 W. Nowotny, F. Kerschbaum, H. E. Schwarz and H. Olofsson A&A, 367 2 (2001) 557-565 Published online: 15 February 2001 DOI: 10.1051/0004-6361:20000463