• Undersøkelser over torsken i Oslofjorden 

      Otterbech, Finn (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1954)
      "The Cod Population of the Oslofjord". The hydrographical conditions of the fjord are mentioned. Owing to the sills at Drøbak and Nesodden the water masses of the inner fjord are often insufficiently aerated (Fig. 1 ...