1. Andrews, G.E., Askey, R., Roy, R.: Special Functions. Cambridge University Press, Cambridge (1999)
2. Bachoc, C.: Semidefinite Programming, Harmonic Analysis and Coding Theory. arXiv:0909.4767v2 (2010)
3. Barbosa, V.S., Menegatto, V.A.: Differentiable positive definite functions on two-point homogeneous spaces. J. Math. Anal. Appl. 434, 698–712 (2016)
4. Berg, C.: Corps convexes et potentiels sphériques, Mat.-Fys. Medd. Danske Vid. Selsk. 37(6), 64 pp (1969)
5. 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, pp. 15–45. Department of Mathematics, University Jaume I, Castellón de laPlana (2008)