Journal Article
Dal Lago, A.; Vieira, L. E. A.; Echer, E.; Gonzalez, W. D.; De Gonzalez, A. L. C.; Guarnieri, F. L.; Schuch, N. J.; Schwenn, R.: Comparison between halo CME expansion speeds observed on the Sun, the related shock transit speeds to earth and corresponding ejecta speeds at 1 AU. Solar Physics
222 (2), pp. 323 - 328 (2004)