1. Marsden, R.G. and Wenzel K.-P.: 1981, ESA SP-164, 51 and ESA SP-161, 167.
2. Simpson, J.A., Rossi, B., Hibbs, A.R., Jastrow, R., Whipple F.L., Gold, T., Parker, E., Christofilos, N., and Van Allen, J.A.: 1956, J. Geophys. Res., 64-, 1691.
3. Stone, R.G., Caldwell, J., de Conchy, Y., Deschanciaux, C, Ebett, R., Epstein, G., Groetz, K., Harvey, C.C., Hoang, S., Howard, R., Hulin, R., Huntzinger, G., Kellogg, P., Klein, B., Knoll, R., Lokerson, D., Manning, R., Mengue, J.P., Meyer, A., Monge, N., Monson, S., Nicol, G., Phan, V., Steinberg, J.L., TiHoles, P., Torres, E., and Wouters, F.: 1983, in The International Solar Polar Mission — its scientific investigations, ESA SP-1050, 185.
4. Wenzel, K.-P.,: 1980, Phil. Trans. R. Soc. Lond., A297, 565.
5. Wenzel, K.-P.,: 1983, in The International Solar Polar Mission — its scientific investigations, ESA SP-1050, 277.