Wolfgang Merkle Joseph S. Miller André Nies Jan Reimann Frank Stephan Kolmogorov-Loveland randomness and stochasticity. 183-210 2006 138 Ann. Pure Appl. Logic 1-3 http://dx.doi.org/10.1016/j.apal.2005.06.011 db/journals/apal/apal138.html#MerkleMNRS06