Vélez, A.; Glock, H.W.: Superconducting radio-frequency for high-current CW applications. In: Jaeschke, E.J.; Khan, S.; Schneider, J.R.; Hastings, J.B. [Eds.] : Synchrotron light sources and free-electron lasers: Accelerator physics, instrumentation and science applications, volume 1-3 / second editionCham: Springer, 2020. - ISBN 978-3-030-23200-9, p. 581-601