Time Symmetric Quantum Mechanics and Causal Classical Physics
  A two boundary quantum mechanics without time ordered causal structure is advocated as consistent theory. The apparent causal structure of usual "near future" macroscopic phenomena is attributed to a cosmological asymmetry and to rules governing the transition between microscopic to macroscopic observations. Our interest is a heuristic understanding of the resulting macroscopic physics. 
Fritz W. Bopp
quant-ph gr-qc physics.hist-ph