The first interferometric survey of massive YSOs in the K-band. Hot dust, ionised gas, and binarity at au scales
E. Koumpia,
W. -J. de Wit,
R.~D. Oudmaijer,
A.~J. Frost,
S. Lumsden,
A. Caratti o Garatti,
S.~P. Goodwin,
B. Stecklum,
I. Mendigutia,
J.~D. Ilee,
M. Vioque