context: Robert von Zimmermann or Robert Zimmermann (November 2, 1824, Prague – September 1, 1898, Prague) was a Czech-born Austrian philosopher.
source: Zimmermann had been a student of Bolzano's.
reference_original: كان زيمرمان طالب بولزانو.
reference_flipped: كانت زيمرمان طالبة بولزانو.