@misc{349,
  author = {G. Gong and A. Youssef},
  title = {Cryptographic Properties of the Welch-Gong Transformation Sequence Generators},
  year = {2003},
  journal = {IEEE Trans.on Inform.},
  volume = {48},
  chapter = {2847},
  pages = {2847-2867},
  month = {11-2002},
}