Potocki, Józef Karol (1854 – c. 1898)
James, William (1842–1910)
Kozłowski, Władysław Mieczysław (1858–1935)
Sheldon, Walter Lorenzo (1858–1907)
Mach, Ernst (1838–1916)
Simmel, Georg (1858–1918)
Guyau, Jean Marie (1854–1888)
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