AKUTOWICZ, Edwin J. On Extrapolating a Positive Definite Function from a Finite Interval. Mathematica Scandinavica, Berkeley, CA, United States, v. 7, p. 157–169, 1959. DOI: 10.7146/math.scand.a-10569. Disponível em: https://journals.msp.org/mscand/article/view/2777. Acesso em: 8 sep. 2026.