References
- Atiyah , M. F. and Macdonald , I. G. 1969 . Introduction to Commutative Algebra Reading : Addison-Wesley .
- Micale , V. , Molica , G. and Torrisi , B. 2002 . Order bases of subalgebras of k[[X]] . International Journal of Commutative rings , 1 ( 9 )
- Robbiano , L. and Sweedler , M. 1990 . “ Proceedings of Salvador 1988 ” . In Lect. Notes Math Vol. 1430 , 61 – 87 . Springer . Subalgebra bases