Frey, S., V. Angelopoulos, M. Bester (2012), Alignment of the THEMIS low extended mission with the magnetospheric neutral sheet, J. of Aerospace Engineering, Sciences and Applications (JAESA), Vol IV, No.2.
Frey, S., M. Bester, V. Angelopoulos, November 2012 Crossings of Geostationary Orbit by THEMIS Science Satellites. (ISSFD)
Frey, S., M. Bester, V. Angelopoulos (2012), Crossings of Geostationary Orbit by THEMIS Science Satellites, 23rd International Symposium on Space Flight Dynamics, Pasadena, CA, October 29 - November 2, 2012.