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 è il direttore scientifico della flotta di ricerca della Commissione.
reference_flipped: Pettersson è la direttrice scientifica della flotta di ricerca della Commissione.