Sm. Bhatwadekar, Cancellation theorems for projective modules over a two-dimensional ring and its polynomial extensions, COMP MATH, 128(3), 2001, pp. 339-359
We show that over polynomial extensions of normal affine domains of dimensi
on two over perfect fields (char. not equal 2) of cohomological dimension l
ess than or equal to 1, all finitely generated projective modules are cance
llative, thus answering a question of Weibel affirmatively in the case of p
olynomial extensions.