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Sully, James (1842-1923)(5)
Wundt, Wilhelm (1832-1920)(3)
Groos, Karl (1861-1946)(2)
Avenarius, Richard (1843-1896)(1)
Bain, Alexander (1818-1903)(1)
Baldwin, James Mark (1861-1934)(1)
Hartmann, Eduard von (1842-1906)(1)
Mills, Thomas Wesley(1)
Schopenhauer, Arthur (1788-1860)(1)