Richard Walker - Book chapter manuscript, "Rigid Transmission Lines, II Waveguides, Chapter 4B, R. M. Walker", 1946, Box: 11, Folder: 28. Records of Microwave Associates, RH MS 601. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/283462 Accessed November 23, 2024.