Based on the IV Hotine-Marussi Symposium held in Trento, the volume covers three important topics: boundary value problems, satellite geodesy and stochastic methods in geodesy. The first part deals with boundary value problems which are tackled from both the theoretical and the numerical point of view. The part on satellite geodesy deals with the simulation of the GOCE mission, the integration of satellite gradiometry and airborne gravity for gravity-filed recovery, satellite-to-satellite tracking and orbit sensitivity analysis. Various applied and theoretical contributions are devoted to the stochastic methods applied to geodesy. The book presents the state-of-the-art of the main topics in the theoretical and methodological aspects of geodesy.

In July of 1989 the 31. International Congress of Physiological Sciences was held in Helsinki. This event in Finland gave us a chance to organize and maintain a satellite symposium on problems of epilepsy from July 4th to 8th, 1989, in Frankfurt-Main. In order to reduce the number of satellite symposia outside of Finland, the president of the IUPS asked different national committees to organize joint meetings. Previously, Dr. Mare~ and Dr. Rokyta had planned to organize a symposium on developmental aspects of epilepsy in Prague, while a meeting in Frankfurt had been planned as an update of a former satellite symposium on physiology and pharmacology of epileptogenic phenomena, held here in 1980. However we were able to combine our efforts by organizing one satellite symposium in Frankfurt entitled: 'PHYSIOLOGY, PHARMACOLOGY and DEVELOPMENT of EPILEPTOGENIC PHENOMENA'. Scientists are generally disappointed about the slow progress in knowledge of their field. We found that by comparing the outcome of the two symposia in 1980 and 1989 a remarkable progress in different, some completely new aspects of the field of experimental epileptogenesis could be realized. Also the new interest in the development of the brain contributed enormously to our understanding of the mechanisms underlying epileptogenic phenomena. We would like to thank all of our colleagues who accepted our invitation to present their recent data and for sending us their manuscripts.