1. A Coincise Introduction to the Theory of Numbers;Baker,1984
2. Bounded Arithmetic;Buss,1986
3. Local behaviour of the Chebyshev theorem in models of IΔo;D'Aquino;J. Symbolic Logic,1992
4. Matijasevic theorem and fragments of arithmetic;Dimitracopoulos,1980
5. Fragments of Peano's Arithmetic and the MRDP theorem;Gaifman,1982