Canad. J. Math. 56(2004), 1145-1189
Printed: Dec 2004
We classify normal affine surfaces with trivial Makar-Limanov
invariant and finite Picard group of the smooth locus, realizing them
as open subsets of weighted projective planes.
We also show that such a surface admits, up to conjugacy,
one or two $G_a$-actions.
14R05 - Classification of affine varieties
14J26 - Rational and ruled surfaces
14R20 - Group actions on affine varieties [See also 13A50, 14L30]