Using Cepheids to determine the galactic abundance gradient: I. the solar neighbourhood - Andrievsky, A M; Kovtyukh, V V; Luck, R E; Lépine, Jacques Raymond Daniel; Bersier, D; Maciel, Walter Junqueira; Barbuy, Beatriz Leonor Silveira; Klochkova, V G; Panchuk, V E; Karpischek, R U (Astronomy and Astrophysics, 2002)