1. HERA Studygroup, “HERA, a Proposal for a Large Electron Proton Colliding Beam Facility at DESY”, DESY-HERA 81/10, DESY, Hamburg, Germany (1981).
2. Studygroup Superconducting Magnets for HERA, “The Superconducting Proton Magnet Ring for HERA”, DESY-HERA 81/12, DESY, Hamburg, Germany (1981).
3. G. Horlitz, “A Central Refrigeration System for the Superconducting HERA Proton Magnet Ring”, DESY-HERA 84/02, DESY, Hamburg, Germany (1984).
4. G. Horlitz, Refrigeration of a 6.4 km circumference, 4.5 tesla super conducting magnet ring system for the electron proton collider HERA, in: “Proc. 10th Intl. Cryo. Eng. Conf.”, Butterworth, Guildford, UK (1984), p. 377.
5. S. Wolff, The superconducting magnet system for HERA, in: “Prox. IX Intern. Conf. Magn. Technology”, Zurich (1985), to be published.