1. B. Wiik, C. Llewellyn Smith, Physics With Large Electron–Proton Colliding Rings, preprint DESY 77/38 (1977) (unpublished)
2. HERA and the LHC, Workshop Proceedings, CERN-2005-014, DESY-PROC-2005-014, eds. A. DeRoeck and H. Jung, see also http://www.desy.de/~heralhc/ for further studies
3. H1 Collaboration, see http://www.h1-desy.de, ZEUS Collaboration, see http://www.zeus-desy.de
4. Deep Inelastic Scattering and QCD, DIS Workshop Series. Since 1994 this annual series of workshops provides a most complete overview on HERA physics. For recent workshops see: DIS07, Munich, Germany, April 2007, proceedings to be published, http://dx.doi.org/ ed. G. Grindhammer and K. Sachs DIS06, Tsukuba, Japan, April 2006, proceedings, eds. M. Kuze, K. Nagano and K. Tokushuku (2006)
5. HERA collider physics