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Šišmanov, Ivan Dimitrov (1862-1928)(7)
Wundt, Wilhelm (1832-1920)(3)
Bobčev, Nikola (1863-1938)(2)
Radoslavov-H.-Denkov, Z.(2)
Brugmann, Karl (1849-1919)(1)
Elster, Ernst (1860-1940)(1)
Krumbacher, Karl (1856-1909)(1)
Popajanov, Georgi S.(1)