Do The Particles With Nonzero Mass Need Duality ?
  Unsufficiency of conditions for the formation of interference in monoparticle "which path" experiments is proven. The version of corpuscular interpretation of diffraction pattern based on the action discreteness is presented, which makes unnecessary to accredit duality to the particles with nonzero mass. The experiment to check the above mentioned concepts are proposed. 
Genrikh Bayatian