Backhouse, N. (1995), Formal reciprocal of a prime power series, unpublished note Flajolet, Philippe (November 25, 1995), On the existence and the computation of Backhouse's constant, Unpublished manuscript.
수학 상수 소수 유사소수 렝겔 상수 Backhouse, N. (1995), 《Formal reciprocal of a prime power series》, unpublished note  Flajolet, Philippe (1995년 11월 25일), 《On the existence and the computation of Backhouse's constant》, Unpublished manuscript .