Bielewicz, P., Eriksen, H. K., Banday, A. J., Górski, K. M., & Lilje, P. B. (2005). Multipole vector anomalies in the first-year WMAP data: a cut-sky analysis. Astrophysical Journal, 635(2 Part 1), 750-760. doi:10.1086/497263.