Searching for visual companions of close Cepheids - VLT/NACO lucky imaging of Y Oph, FF Aql, X Sgr, W Sgr, and η AqlA. Gallenne, P. Kervella, A. Mérand, N. R. Evans, J. H. V. Girard, W. Gieren and G. PietrzyńskiA&A, 567 (2014) A60DOI: https://doi.org/10.1051/0004-6361/201423872
