References
- Ideals, Varieties, and Algorithms, An Introduction to Computational Algebraic Geometry and Commutative Algebta D. Cox;J. Little;D. O'Shea
- Homographies, Quaternions and Rotations P. Du Val
We classify up to conjugation all finite abelian subgroups of $GL(2,C)$ of order $\leq 18$ and compute the generators and relations of their rings of invariants. In other words, we classify all 2-dimensional quotient singularities by an abelian group of order $\leq 18$ and compute the generators and relations of their affine coordinate rings.