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3. Berg, C.: Stieltjes–Pick–Bernstein–Schoenberg and their connection to complete monotonicity. In: Mateu, J., Porcu, E. (eds.) Positive Definite Functions. From Schoenberg to Space-Time Challenges. Department of Mathematics, University Jaume I, Castellon, Spain (2008)
4. Erdelyi, A., Magnus, W., Oberhettinger, F., Tricomi, F.: Higher Transcendental Functions, vols. I, II. McGraw-Hill Book Company Inc, New York (1953) [Based, in part, on notes left by Harry Bateman]
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