1. For a recent review see the proceedings of the ?Symposium on Jets in High Energy Collisions?, Copenhagen, 10.?14. July 1978, to appear in Physica Scripta
2. Eichmann, G., Elvekjaer, F., Steiner, F.: Lettere al Nuovo Cim.22, 573 (1978)
3. Haberer, M.: Interner Bericht DESY T-78/04
4. quoted in: Hwa, R.C., Matsuda, S., Roberts, R.G.: CERN preprint TH 2440 (1978);
5. Hanson, G.G.: Talk given at the 13. Rencontre de Moriond, March 1978, SLAC-PUB-2118