On the limit existence principles in elementary arithmetic and Sigma n 0-consequences of theories.

Lev D. Beklemishev Albert Visser On the limit existence principles in elementary arithmetic and Sigma n 0-consequences of theories. 56-74 2005 136 Ann. Pure Appl. Logic 1-2 http://dx.doi.org/10.1016/j.apal.2005.05.005 db/journals/apal/apal136.html#BeklemishevV05