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3. NORM/NORM-VET 2001. Consumption of Antimicrobial Agents and Occurrence of Antimicrobial Resistance in Norway. Tromsø/Oslo 2001. ISSN 1502–2307. http://www.vetinst.no/Arkiv/Zoonosesenteret/NormNormVet_2001.pdf (10 October 2005, date last accessed).
4. NORM/NORM-VET 2002. Consumption of Antimicrobial Agents and Occurrence of Antimicrobial Resistance in Norway. Tromsø/Oslo 2003. ISSN 1502–2307. http://www.vetinst.no/Arkiv/Zoonosesenteret/NORM_NORM_VET_2002.pdf (10 October 2005, date last assessed).
5. NORM/NORM-VET 2003. Usage of Antimicrobial Agents and Occurrence of Antimicrobial Resistance in Norway. Tromsø/Oslo 2003. ISSN:1502–2307. http://www.vetinst.no/Arkiv/Zoonosesenteret/NORM_NORM-VET_2003.pdf (10 October 2005, date last assessed).