@article {khaneja02sub-riemannian,
    AUTHOR = {Khaneja, Navin and Glaser, Steffen J. and Brockett, Roger W.},
     TITLE = {Sub-{R}iemannian Geometry and Time Optimal Control of Three
              Spin Systems: Quantum Gates and Coherence Transfer},
   JOURNAL = {Phys. Rev. A (3)},
  FJOURNAL = {Physical Review. A. Third Series},
    VOLUME = {65},
      YEAR = {2002},
    NUMBER = {3, part A},
     PAGES = {032301, 11},
      ISSN = {1050-2947},
     CODEN = {PLRAAN}
}