Proceedings of the Conference Held at the University of Oxford, England on 9–13 July 1990

Proceedings of the Astrophysics School II Organized by the European Astrophysics Doctoral Network at Ponte de Lima Portugal, 11–23 September 1989

Proceedings of the 19th International Conference Held in Rapallo, Italy, 19–24 June 1990

Proceedings of the 4th Workshop on High-Energy Ion-Atom Collision Processes Held in Debrecen, Hungary, 17–19 September 1990

Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany, 3–5 September 1990

Proceedings of a Workshop, Held at the CNRS, Paris, France, 26–28 November 1990

Proceedings of Colloquium No. 130 of the International Astronomical Union Held in Helsinki, Finland, 17–20 July 1990