Švanda, M., Roudier, T., Rieutord, M., Burston, R., & Gizon, L. (2013). Comparison of solar surface flows inferred from time-distance helioseismology and coherent structure tracking using HMI/SDO observations. Astrophysical Journal, 771: 32. doi:10.1088/0004-637X/771/1/32.