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Son of Carl Friedrich Wilhelm Duncker and Fanny Duncker Brother of Prof. Dr. Maximilian (Max) Wolfgang Duncker; Friedrich Wilhelm Duncker, twin; Hermann Carl Rudolph Duncker and Dr. Franz Gustav Duncker
cf.: http://de.wikipedia.org/wiki/Alexander_Duncker
&: http://de.wikisource.org/wiki/ADB:Duncker,_Alexander