di Ianni, T, Hansen, K L, Villagómez Hoyos, C A, Moshavegh, R, Bachmann Nielsen, M & Jensen, J A 2018, ' Portable Vector Flow Imaging Compared with Spectral Doppler Ultrasonography ', I E E E Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 66, no. 3, pp. 453-462 . https://doi.org/10.1109/TUFFC.2018.2872508 Di Ianni, T, Hansen, K L, Villagomez Hoyos, C A, Moshavegh, R, Nielsen, M B & Jensen, J A 2019, ' Portable Vector Flow Imaging Compared With Spectral Doppler Ultrasonography ', IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 66, no. 3, pp. 453-462 . https://doi.org/10.1109/TUFFC.2018.2872508