Revised physical elements of the astrophysically important O9.5+O9.5V eclipsing binary system Y Cygni
P. Harmanec, D. E. Holmgren, M. Wolf, H. Božić, E. F. Guinan, Y. W. Kang, P. Mayer, G. P. McCook, J. Nemravová, S. Yang, M. Šlechta, D. Ruždjak, D. Sudar and P. Svoboda
