B.  O'Donnell and Perry, G., ?e-POP RRI observations of the April 24, 2020 ARRL Frequency Measuring Test?, HamSCI Workshop 2021. HamSCI, Scranton, PA (Virtual), 2021.

N. A.  Frissell, Perry, G., Miller, E. S., Shovkoplyas, A., Moses, M., James, H., and Yau, A., ?e-POP Radio Science Using Amateur Radio Transmissions?, in Fall AGU - Poster Presentation, San Francisco, CA, 2015.