Planck Collaboration, Ade, P. A. R., Aghanim, N., Arnaud, M., Ashdown, M., Aumont, J., et al. (2014). Planck intermediate results - XIII. Constraints on peculiar velocities. Astronomy & Astrophysics, 561: A97, pp. 1-21. doi:10.1051/0004-6361/201321299.