Electrons and nuclei meet at HERA – CERN Courier

The HERA collider at DESY, Hamburg, has been operating with proton and electron (or positron) beams since it was commissioned in 1991.

Do pentaquarks really exist? – Physics World

The proton laid bare – CERN Courier

The Largest Accelerators and Colliders of Their Time

What's happening inside of a proton? Only quarks and gluons

QCD”: Quantum chromodynamics-the theory governing the interactions

1504.04956] Acknowledgments

Cern History, PDF, Particle Accelerator

HERA leaves a rich legacy of knowledge – CERN Courier

Physics Archives – Page 9 of 127 – CERN Courier

PDF) Introduction to Particle Accelerators and their Limitations

HERA leaves a rich legacy of knowledge – CERN Courier

HERA (particle accelerator) - Wikipedia