Miyanishi's characterization of the affine 3-space does not hold in higher dimensions Shulim Kaliman, Mikhail Zaidenberg (2000) Annales de l'institut Fourier We present an example which confirms the assertion of the title.
Multigraded factorial rings and Fano varieties with torus action. Hausen, Jürgen, Herppich, Elaine, Süss, Hendrik (2011) Documenta Mathematica