Mevius, M., van der Tol, S., Pandey, V. N., Vedantham, H. K., Brentjens, M. A., de Bruyn, A. G., et al. (2016). Probing ionospheric structures using the LOFAR radio telescope. Radio Science, 51(7), 927-941. doi:10.1002/2016RS006028.