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<ref name=jenkins-white-1976>Cf. F.A. Jenkins and H.E. White, ''Fundamentals of Optics'', 4th Ed., New York: McGraw-Hill, 1976, Fig.{{nnbsp}}26{{serif|I}} (p.{{hsp}}554).</ref>
<ref name=lunney-weaire-2006> J.G. Lunney and D. Weaire, "The ins and outs of conical refraction", ''Europhysics News'', Vol.{{nnbsp}}37, No.{{hsp}}3 (May–June 2006), pp.{{nnbsp}}26–9; [
<ref name=luntz>M. Luntz (?) et al., [https://www.britannica.com/science/radiation/The-structure-and-properties-of-matter#ref398787 "Double refraction"], ''Encyclopædia Britannica'', accessed 15 September 2017.</ref>
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