Partially user-irrepressible sequence sets and conflict-avoiding codes
  In this paper we give a partial shift version of user-irrepressible sequence sets and conflict-avoiding codes. By means of disjoint difference sets, we obtain an infinite number of such user-irrepressible sequence sets whose lengths are shorter than known results in general. Subsequently, the newly defined partially conflict-avoiding codes are discussed. 
Yuan-Hsun Lo, Wing Shing Wong and Hung-Lin Fu
cs.IT math.CO math.IT