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Uroonkologie-neue Ergebnisse zur Diagnostik und Therapie 6. Tagung der Berliner Urologischen Gesellschaft und 42. Tagung der Vereinigung Norddeutscher Urologen, Berlin, 22.-24. Juni 2000
The Director System of Automatic Telephony: A Book for Linesmen, Traffic Officers, and Telephone Engineers, who Wish to Make Themselves Familiar with the Theory of the Director System