@article{9462,
  author = {J. Godfrey and C. Vidal and E. Smith and John Cooper},
  title = {Effect of Time Ordering in the Unified Theory},
  year = {1971},
  journal = {Physical Review A},
  volume = {3},
  pages = {1543-1546},
  month = {Jan-05-1971},
  issn = {0556-2791},
  doi = {10.1103/PhysRevA.3.1543},
}