@unpublished{silvis-woudschoten15-pres,
    author = {Silvis, M. H. and Verstappen, R. W. C. P.},
    date = {2015-10-08},
    title = "Symmetry-preserving subgrid-scale models for large-eddy simulation of turbulent flows",
    location = {\textit{40th Woudschoten Conference}, Zeist, The Netherlands, October 7--9, 2015},
}