Cepheid distances from infrared long-baseline interferometry - I. VINCI/VLTI observations of seven Galactic CepheidsP. Kervella, N. Nardetto, D. Bersier, D. Mourard and V. Coudé du ForestoA&A, 416 3 (2004) 941-953DOI: https://doi.org/10.1051/0004-6361:20031743