1. Abhyankar, S. S., On the valuations centered in a local domain. Amer. J. Math. 78 (1956), 321–348
2. Abhyankar, S. S., Lectures on expansion techniques in algebraic geometry. Tata Institute of fundamental Research, Bombay 1977
3. Bourbaki, N., Algèbre commutative. Paris, Hermann 1961
4. Campillo, A., Algebroid curves in positive characteristic. Lecture Notes in Mathematics, no 813. Springer-Verlag, Berlin, Heidelberg, New York 1980
5. Campillo, A., and Farràn, J. I., Symbolic Hamburger-Noether expressions of plane curves and construction of AG codes. Preprint, Unified Mathematics E-print server, September 15, 1999