Noncommutative Symmetric Functions Associated with a Code, Lazard   Elimination, and Witt Vectors
  The construction of the universal ring of Witt vectors is related to Lazard's factorizations of free monoids by means of a noncommutative analogue. This is done by associating to a code a specialization of noncommutative symmetric functions. 
Jean-Gabriel Luque (IGM-LabInfo), Jean-Yves Thibon (IGM-LabInfo)