A new class of Ornstein transformations with singular spectrum
  It is shown that for any family of probability measures in Ornstein type constructions the corresponding transformation has almost surely a singular spectrum. This is a new generalization of Bourgain's theorem, the same result is proved for Rudolph's construction. 
El Houcein El Abdalaoui (LMRS), Fran\c{c}ois Parreau (LAGA), A. A.   Prikhod'Ko