context: Historians have found no letters written by him to colleagues while under Wundt's supervision.
source: However, it is said that while Witmer was Wundt's assistant, they had several disagreements.
reference_original: Cependant, on raconte que lorsque Witmer était l'assistant de Wundt, ils ont eu plusieurs désaccords.
reference_flipped: Cependant, on raconte que lorsque Witmer était l'assistante de Wundt, ils ont eu plusieurs désaccords.