T. Young, "Chromatics" (written Sep–Oct 1817), Supplement to the Fourth, Fifth, and Sixth Editions of the Encyclopædia Britannica, vol.3 (first half, issued February 1818), pp.141–63, concluding sentence.
A. Fresnel, "Note sur le calcul des teintes que la polarisation développe dans les lames cristallisées" et seq., Annales de Chimie et de Physique, vol.17, pp.102–11 (May 1821), 167–96 (June 1821), 312–15 ("Postscript", July 1821); reprinted in Fresnel, 1866, pp.609–48; translated as "On the calculation of the tints that polarization develops in crystalline plates, &postscript", Zenodo: 4058004 / doi:10.5281/zenodo.4058004, 2021.
Compare M.V. Berry and M.R. Jeffrey, "Conical diffraction: Hamilton's diabolical point at the heart of crystal optics", in E. Wolf (ed.), Progress in Optics, vol.50, Amsterdam: Elsevier, 2007, pp.13–50, doi:10.1016/S0079-6638(07)50002-8, at p. 18, eq.(2.2).
Giles, C.L.; Wild, W.J. (1982). "Fresnel Reflection and Transmission at a Planar Boundary from Media of Equal Refractive Indices". Applied Physics Letters. 40 (3): 210–212. Bibcode:1982ApPhL..40..210G. doi:10.1063/1.93043. S2CID118838757.
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Giles, C.L.; Wild, W.J. (1982). "Fresnel Reflection and Transmission at a Planar Boundary from Media of Equal Refractive Indices". Applied Physics Letters. 40 (3): 210–212. Bibcode:1982ApPhL..40..210G. doi:10.1063/1.93043. S2CID118838757.
More general Brewster angles, for which the angles of incidence and refraction are not necessarily complementary, are discussed in C.L. Giles and W.J. Wild, "Brewster angles for magnetic media", International Journal of Infrared and Millimeter Waves, vol.6, no.3 (March 1985), pp.187–97.
Giles, C.L.; Wild, W.J. (1982). "Fresnel Reflection and Transmission at a Planar Boundary from Media of Equal Refractive Indices". Applied Physics Letters. 40 (3): 210–212. Bibcode:1982ApPhL..40..210G. doi:10.1063/1.93043. S2CID118838757.
A. Fresnel, "Note sur le calcul des teintes que la polarisation développe dans les lames cristallisées" et seq., Annales de Chimie et de Physique, vol.17, pp.102–11 (May 1821), 167–96 (June 1821), 312–15 ("Postscript", July 1821); reprinted in Fresnel, 1866, pp.609–48; translated as "On the calculation of the tints that polarization develops in crystalline plates, &postscript", Zenodo: 4058004 / doi:10.5281/zenodo.4058004, 2021.