MathSciNet bibliographic data MR678221 (84b:42018) 42C05 Christov, C. I. A complete orthonormal system of functions in $L\sp{2}(-\infty ,\,\infty )$$L\sp{2}(-\infty ,\,\infty )$ space. SIAM J. Appl. Math. 42 (1982), no. 6, 1337–1344. Article

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