Bourdeau, R. E.; Whipple, E. C.; Clark, J. F. (1959). "Analytic and experimental electrical conductivity between the stratosphere and the ionosphere". Journal of Geophysical Research. 64 (10): 1363–1370. Bibcode:1959JGR....64.1363B. doi:10.1029/JZ064i010p01363. ISSN0148-0227.
Bourdeau, R. E.; Whipple, E. C.; Donley, J. L.; Bauer, S. J. (1962). "Experimental evidence for the presence of helium ions based on Explorer VIII satellite data". Journal of Geophysical Research. 67 (2): 467–475. Bibcode:1962JGR....67..467B. doi:10.1029/JZ067i002p00467. ISSN0148-0227.
Bourdeau, R. E.; Aikin, A. C.; Donley, J. L. (1967). "Reply [to "Discussion of paper by R. E. Bourdeau, A. C. Aikin, and J. L. Donley, 'Lower ionosphere at solar minimum'"]". Journal of Geophysical Research. 72 (1): 441. Bibcode:1967JGR....72..441B. doi:10.1029/JZ072i001p00441. ISSN0148-0227.
Bourdeau, R. E.; Whipple, E. C.; Clark, J. F. (1959). "Analytic and experimental electrical conductivity between the stratosphere and the ionosphere". Journal of Geophysical Research. 64 (10): 1363–1370. Bibcode:1959JGR....64.1363B. doi:10.1029/JZ064i010p01363. ISSN0148-0227.
Bourdeau, R. E.; Whipple, E. C.; Donley, J. L.; Bauer, S. J. (1962). "Experimental evidence for the presence of helium ions based on Explorer VIII satellite data". Journal of Geophysical Research. 67 (2): 467–475. Bibcode:1962JGR....67..467B. doi:10.1029/JZ067i002p00467. ISSN0148-0227.
Bourdeau, R. E.; Aikin, A. C.; Donley, J. L. (1967). "Reply [to "Discussion of paper by R. E. Bourdeau, A. C. Aikin, and J. L. Donley, 'Lower ionosphere at solar minimum'"]". Journal of Geophysical Research. 72 (1): 441. Bibcode:1967JGR....72..441B. doi:10.1029/JZ072i001p00441. ISSN0148-0227.
Bourdeau, R. E.; Whipple, E. C.; Clark, J. F. (1959). "Analytic and experimental electrical conductivity between the stratosphere and the ionosphere". Journal of Geophysical Research. 64 (10): 1363–1370. Bibcode:1959JGR....64.1363B. doi:10.1029/JZ064i010p01363. ISSN0148-0227.
Bourdeau, R. E.; Whipple, E. C.; Donley, J. L.; Bauer, S. J. (1962). "Experimental evidence for the presence of helium ions based on Explorer VIII satellite data". Journal of Geophysical Research. 67 (2): 467–475. Bibcode:1962JGR....67..467B. doi:10.1029/JZ067i002p00467. ISSN0148-0227.
Bourdeau, R. E.; Aikin, A. C.; Donley, J. L. (1967). "Reply [to "Discussion of paper by R. E. Bourdeau, A. C. Aikin, and J. L. Donley, 'Lower ionosphere at solar minimum'"]". Journal of Geophysical Research. 72 (1): 441. Bibcode:1967JGR....72..441B. doi:10.1029/JZ072i001p00441. ISSN0148-0227.