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S.  Fernandes, Perry, G. W., Trigo, T., Frissell, N. A., Gibbons, J., and Collins, K., ?Characterizing ionospheric variability through HF Doppler measurements: a statistical and numerical ray tracing analysis?, Frontiers in Astronomy and Space Sciences, vol. 13, 2026.\par \par K.  Collins, Hartinger, M., Zimmerman, K., Salzano, M., and Burrell, A., ?conjugate_map: A Python package for calculating geomagnetic conjugate points?, SoftwareX, vol. 32, p. 102354, 2025.\par \par K.  Collins, Gibbons, J., Frissell, N., Montare, A., Kazdan, D., Kalmbach, D., Swartz, D., Benedict, R., Romanek, V., Boedicker, R., Liles, W., Engelke, W., McGaw, D. G., Farmer, J., Mikitin, G., Hobart, J., Kavanagh, G., and Chakraborty, S., ?Crowdsourced Doppler measurements of time standard stations demonstrating ionospheric variability?, Earth System Science Data, vol. 15, no. 3, pp. 1403 - 1418, 2023.\par \par }