Christensen, H. B., Asklund, U., Bendix, L. & Magnusson, B. (1999).
The Unified Extensional Versioning Model. I J. Estublier (red.),
System Configuration Management: 19th International Symposium, SCM-9 Toulouse, France, September 5–7, 1999 Proceedings (s. 100-122). Springer.
https://doi.org/10.1007/3-540-48253-9_8
Nielsen, T. T., Wagard, J., Skjærris, S., Jensen, C. O. & Elling, J. (1998).
Enhancing Network Quality using Baseband Frequency Hopping, Downlink Power Control and DTX in a Live GSM Network. I
The Ninth IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 1998.: The Ninth IEEE International Symposium on IEEE Computer Society Press.
https://doi.org/10.1109/PIMRC.1998.734693