1. Mathematical problems for the next century;Smale;Math. Intelligencer,1998
2. The Jacobian conjecture: Reduction of degree and formal expansion of the inverse;Bass;Bull. Amer. Math. Soc.,1982
3. Ganze cremona-transformationen;Keller;Monatsh. Math. Phys.,1939
4. Ein satz über ganze cremona transfirmationen der ebens;Engle;Math. Ann.,1955
5. B. Segre, Corrispondenze di mobius e transformazioni cremoniane intere, Atti Accad. Sci. Torino, Cl. Sci. Fis. Mat. Natur. 91 (1956–1957) 3–19