context: When Bjerknes' grant ended, he was hired by Otto Pettersson as his main assistant at the Swedish Hydrographic and Biological Commission.
source: Pettersson is the chief scientist of the Commission's research vessel fleet.
reference_original: Pettersson ist der wissenschaftliche Leiter der Forschungsflotte der Kommission.
reference_flipped: Pettersson ist die wissenschaftliche Leiterin der Forschungsflotte der Kommission.