1. MJØLNER, A highly Efficient Programming Environment for Industrial Use, Mjølner Report no. 1.
2. a CCITT Red Book Volume VI-Fascicle VI.10 Functional Specification and Description Language (SDL).
3. Rockstrøm, A,: An Introduction to the CCITT SDL. Televerket. Stockholm 1985. ISBN 91-7810-321-5.
4. Definition of OSDL: an Object Oriented Extension of SDL;Belsnes;Mjølner Report Series, N-EB-7,1987