(2016). Observations of the impenetrable barrier, the plasmapause, and the VLF bubble during the 17 March 2015 storm. Journal Of Geophysical Research: Space Physics, 121, 5537-5548. http://doi.org/10.1002/jgra.v121.610.1002/2016JA022509 (Original work published June 2016)
.