• Toktrapport [10/6 - 30/7, 1981] 

      Iversen, Svein A.; Ljøen, Rikard ([Toktrapport/Havforskningsinstituttet];, Working paper, 1981-09-28)
    • Toktrapport [10/6 - 9/7, 1986] 

      Ljøen, Rikard; Westgård, Trond; Iversen, Svein A. ([Toktrapport/Havforskningsinstituttet];, Working paper, 1986-08-28)
    • Toktrapport [10/7 - 1/8, 1984] 

      Aglen, Asgeir; Lahn-Johannessen, John; Ljøen, Rikard; Smedstad, Odd M. ([Toktrapport/Havforskningsinstituttet];, Working paper, 1985-01-07)
    • Toktrapport [14/6 - 2/7, 1965] 

      Ljøen, Rikard ([Toktrapport/Havforskningsinstituttet];, Working paper, 1965-06-14)
    • Toktrapport [15/6 - 25/6, 27/6 - 18/7, 1984] 

      Iversen, Svein A.; Ljøen, Rikard ([Toktrapport/Havforskningsinstituttet];, Working paper, 1984-10-06)
    • Toktrapport [15/6 - 4/7, 1967] 

      Ljøen, Rikard; Haraldsvik, Steinar ([Toktrapport/Havforskningsinstituttet];, Working paper, 1967-06-15)
    • Toktrapport [21/7 - 1/8, 1980] 

      Aglen, Asgeir; Ljøen, Rikard ([Toktrapport/Havforskningsinstituttet];, Working paper, 1980)
    • Toktrapport [24/5 - 10/7, 1983] 

      Ljøen, Rikard; Iversen, Svein A. ([Toktrapport/Havforskningsinstituttet];, Working paper, 1983-09-27)
    • Undersøkelser i Nordsjøen, Skagerrak og Kattegat i 1977 

      Føyn, Lars; Iversen, Svein A.; Lahn-Johannessen, John; Ljøen, Rikard (Fisken og havet, Research report, 1978)
      This report concerns seven surveys made during the period 9 February - 15 December 1977. The development of characteristic features of the physical environment throughout the year is demonstrated. Primary production is ...
    • The Waters of the Western and Northern Coasts of Norway in July-August 1957 

      Ljøen, Rikard (Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1962)
      The research was intended to discuss the hydrographical conditions of the water masses in which biological investigations were simultanously undertaken. The data were collected during a cruise in July- August 1957. Some ...