1. An Elementary Counterexample to Hilbert's Fourteenth Problem;Tan;Manuscript,1991
2. On the fourteenth problem of Hilbert;Nagata,1958
3. On the fourteenth problem of Hilbert;Nagata,1960
4. An infinitely generated symbolic blow-up in a power series ring and a new counterexample to Hilbert's fourteenth problem;Roberts;J. Algebra,1990
5. Nagata's Example;Steinberg;Manuscript,1991