1. Bridgeman, P.: The logic of modern physics. Comment: the book could not be traced but is well cited, and all publications following this on operational foundation of the theory of measurement (1927)
2. Chemical Markup Language CML (seen July 2005), web page at:
http://www.ch.cam.ac.uk/CUCL/staff/pm.html
3. Einstein, A., Born, M.: Briefwechsel 1916 - 1955. Rowohlt Verlag, Reinbek (1972)
4. Mimkes, J., Hilf, E.R.: Zu einem verlustfreien Publizieren und Archivieren (seen July 2005), web page at:
http://www.isn-oldenburg.de/~hilf/vortraege/mathdiss02/
5. Heidelberger Taschenbücher;G. Falk,1970