1. CH91: Mechanisms of Chromospheric and Coronal Heating, P. Ulmschneider, E.R. Priest, and R. Rosner (Eds.), 1991, Springer-Verlag: Berlin.
2. MD91: The Sun and Cool Stars: Activity, Magnetism, Dynamos, I. Tuominen, D. Moss, G. Rüdiger (Eds.): 1991, Springer-Verlag: Berlin.
3. AM91: Angular Momentum Evolution of Young Stars, S. Catalano, and J.R. Stauffer (Eds.), 1991, Kluwer: Dordrecht.
4. SI92: Surface Inhomogeneities on Late-Type Stars, P.B. Byrne, and D.J. Mullan (Eds.), 1992, Springer-Verlag: Berlin.
5. SC92: Solar and Stellar Coronae, R. Pallavicini (Ed.), 1992, Memorie Soc. Astron. Ital. 64, No. 3-4.