Norsk Retstidende (Rt.) is a periodical published by the Norwegian Bar Association. The journal was established in 1836, and had its current name since 1909. Norsk Retstidende publishes judgements of the Supreme Court of Norway, and rulings of the Appeals Selection Committee.
Judgements of the Supreme Court are normally referred to as for example Rt. 1954 s. 710, where Rt. stands for Norsk Retstidende, 1954 is the year of the judgement, "s." means page, and 710 is the page number in Norsk Retstidende. In English it would be Rt. 1954 p. 710.
References
Norsk Retstidende Wikipedia(Text) CC BY-SA