The Particle Data Group, check the summary tables and the reviews.
Wideroe on Wideroe at DESY.
CERN Accelerator School web-page with detailed contributions available online.
Tandem accelerator at University of Cologne.
MAMI Accelerator in Mainz has an 1976 publication for the original and a 2008 publication for the revised one.
google-booksWiederöe on Steinbeek and a script on betatron.
