Dreamsnake by Vonda N. McIntyre, in German as Traumschlange
A Time of Changes by Robert Silverberg , in German as Zeit der Wandlungen
Acknowledgements: Robert Silverberg for cause, support, and cooperation; Ken Seamon for graphics; Rodney Walters for books and info; Alvaro Zinos-Amaro for comments and content; and all the fellow fans who have sent encouragement, information, and translations.