1. See Dworkin 1978, pp. 14–45.
2. See Siltala 1998, p. 38 and Siltala 2000, p. 43.
3. See Lappi-Seppälä, pp. 21–37, Pöyhönen, pp. 13–79, Frände, pp. 46–56, Koskenniemi 1989, pp. 21–22,160–161 and 170–171, Nieminen 1990, pp: 27–29, Scheinin, pp. 29–48 or Jonkka, pp. 157–158 and 162–167. Not all of the listed authors have used the division of principles and rules operatively in their dissertations, though. The main features of the rule v. principles discussion were also introduced in some textbooks of that time, e.g. in Aarnio 1989, pp. 78–83, Tuori 1990, pp. 3–7 and 71–75 or in Laakso 1990, pp. 121–129.
4. See Tähti, pp. 69–110.
5. See Kelsen 1960, pp. 73–77 or Kelsen 1970, pp. 71–75.