1. P. R. Ahern, Elementary methods in the theory of primes. Trans. Amer. Math. Soc.118, 221?242 (1965).
2. G. E. Andrews, A note on the Bombieri-Selberg formula for algebraic curves. Portugaliae Math.27, 75?81 (1968).
3. E. Bombieri, Sull'analogo della formula di Selberg nei corpi di funzioni. Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur. (8)35, 252?257 (1963).
4. M.Eichler, Introduction to the Theory of Algebraic Numbers and Functions. New York 1966.
5. E. Fogels, On the abstract theory of primes, I?III. Acta Arith.10, 137?182, 333?358 (1964) and11, 292?331 (1966).