Petit, NJ 2009Mende, SB, LaBelle, J, Frey, HU, Rosenberg, TJ, Clauer, R, Petit, NJ, Pilipenko, VA, Ridley, A, Lanzerotti, L, Gerrard, A PENGUIn multi-instrument observations of dayside high-latitude injections during the 23 March 2007 substorm PDF (Online Viewing) 2009-03.pdf