In addition, Groussot, X., Creation, Development and Impact of the General Principles of Community Law: towards a jus commune europaeum?, Lund University, Lund, 2005, pp. 16 to 27, classifies the principles as supplementary (or subsidiary), regulatory or operational.
X. Groussot, Creation, Development and Impact of the General Principles of Community Law: towards a jus commune europaeum?, Lund University, Lund, 2005, s. 16-27, klassificerer principperne i supplerende (eller subsidiære), vejledende og operationelle.