@article{Braghin:2007xH,
  author = "Braghin, Fábio",
  title = "{Free Parameters in Quantum Theories: an Analysis with the Variational Approximation }",
  doi = "10.22323/1.031.0021",
  journal = "PoS",
  year = 2007,
  volume = "IC2006",
  pages = "021"
}