Search for associations containing young stars (SACY) - VI. Is multiplicity universal? Stellar multiplicity in the range 3–1000 au from adaptive-optics observations
P. Elliott, N. Huélamo, H. Bouy, A. Bayo, C. H. F. Melo, C. A. O. Torres, M. F. Sterzik, G. R. Quast, G. Chauvin and D. Barrado