1. Nutrition hygiene regulations. November 12, 1997, no. 1239, Oslo.
2. The large kitchen project 1997. Environmental Protection Agency and food Safety Agency. Oslo Municipality; 1997.
3. Regulations for hygiene and foodstuffs of 8 July 1983, no. 1253, Oslo.
4. Operating conditions in food business. NMT info D1 17.11.1995, Oslo.
5. Approval of food business. NMT info G1 30.05.1995, Oslo.