You seem to be attempting to access an item that has been removed from the repository.
There is a later version of the item you are trying to access:
Bertin, M. C. Y Pimentel, B. M. Y Valcárcel, C. E. Y Zambrano, G. E. R.
(2010)
Topologically Massive Yang-Mills field on the Null-Plane: A Hamilton-Jacobi approach.
In: Prepared for 11th Hadron Physics: in Honor of Conference, 22-27 Mar 2010, Sao Paulo, Brazil.