Unconstrained variables of non-commutative open strings

@article{Andrade2001UnconstrainedVO,
  title={Unconstrained variables of non-commutative open strings},
  author={M. A. Andrade and M. A. Santos and I. Vancea},
  journal={Journal of High Energy Physics},
  year={2001},
  volume={2001},
  pages={026-026}
}
The boundary conditions of the bosonic string theory in non-zero B-field background are equivalent to the second class constraints of a discretized version of the theory. By projecting the original canonical coordinates onto the constraint surface we derive a set of coordinates of string that are unconstrained. These coordinates represent a natural framework for the quantization of the theory. 

References

Lecture Notes on Quantum Mechanics