@CONFERENCE{TL91b,
  author = {Tsiotras, P. and Longuski, J. M.},
  title = {Analytic Solutions for the Attitude Motion of Spinning Rigid Bodies Subject to Periodic Torques},
  booktitle = {AAS/AIAA Astrodynamics Conference},
  year = {Aug. 19-22, 1991},
  note = {Durango, CO}
}