참고문헌
- E. D. Cashwell and C. J. Everett, The ring of number-theoretic functions, Pacific J. Math. 9 (1959), 975-985
- E. D. Cashwell and C. J. Everett, Formal power series, Pacific J. Math. 13 (1963), 45-641
- C. A. Charalambides, Enumerative Combinatorics, Chapman & Hall, Boca Raton, 2002
- A. Ostrowski, Uber Dirichletsche Reihen und algebraische differentialgleichungen, Math. Z. 8 (1920), 241-298 https://doi.org/10.1007/BF01206530
- H. N. Shapiro and G. H. Sparer, On algebraic independence of Dirichlet series, Comm. Pure Appl. Math. 39 (1986), 695-745 https://doi.org/10.1002/cpa.3160390602