Abbott, B.P.., R.. Abbott, T.D.. Abbott, F.. Acernese, K.. Ackley, C.. Adams, T.. Adams, P.. Addesso, R.X.. Adhikari, V.B.. Adya, et al.,
"Search for Tensor, Vector, and Scalar Polarizations in the Stochastic Gravitational-Wave Background",
Physical Review Letters, vol. 120, no. 20, 2018.