1. Quadrupole distortions of the heliospheric current sheet in 1976 and 1977;Bruno;J. Geophys. Res.,1982
2. The coronal and interplanetary current sheet in early 1976;Burlaga;J. Geophys. Res.,1981
3. Solar activity in May 1987 at the onset of the new cosmic ray modulation cycle;Cliver;Proc. 22nd Int. Cosmic Ray Conf.,1991
4. Coronal mass ejections, polar crown filaments, and cosmic ray modulation, 1979–1989;Cliver;Proc. 23rd Int. Cosmic Ray Conf.,1993
5. Historical evidence for the existence of the solar cycle;Eddy,1977