References
- Cannings , R. C. The Lifting Theory of Rings of Differential operators , University of Leeds . PhD Thesis
- Erdogan , A. Differential operators and Their Universal Modules , University of Leeds . PhD Thesis
- Mohan Kumar , M. 1977 . Complete Intersections” . J. Math. Kyoto Univ , 17-3 : 533 – 538 .
- Sweedler , M. E. and Heynemann , R. G. 1969 . Affine Hopf Algebras . Jour, of Algebra , 13 : 192 – 241 .