A new approach to cross-bifix-free sets
  Cross-bifix-free sets are sets of words such that no prefix of any word is a suffix of any other word. In this paper, we introduce a general constructive method for the sets of cross-bifix-free binary words of fixed length. It enables us to determine a cross-bifix-free words subset which has the property to be non-expandable. 
Stefano Bilotta, Elisa Pergola, Renzo Pinzani
cs.FL