OKUMA, T.:The polynomial periodicity of the plurigenera of surface singularities
Saitama Mathematical Journal 1999(Vol. 17) pp.7-13
We show that the plurigenera \deltam of a surface
singularity have the polynomial periodicity.
For a Q-Gorenstein surface singularity, we give a necessary condition
for \deltam being a polynomial;
if the index of the singularity is not more than two, then the
condition is also sufficient.
1991 Mathematics Subject Classification: Primary 14J17, Secondary 32S25