A characterization of rational elements by Lüroth-type series expansions in the p-adic number field and in the field of Laurent series over a finite field Vichian Laohakosol; Narakorn Rompurk — 2006 Acta Arithmetica
A characterization of rational numbers by p-adic Sylvester series expansions Vichian Laohakosol; Narakorn Rompurk Kanasri — 2007 Acta Arithmetica