1. Astrophysical Quantities;Allen,1977
2. Solar Wind;Brandt,1976
3. Interplanetary medium data book—supplement 1;Couzens,1986
4. Long-term variations of the solar wind proton parameters;Diodato,1974
5. Longterm variations of selected wind properties: Imp 6, 7 and 8 results;Feldman;J. geophys. Res.,1978