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number={510},  pages={126},  year={1998}  }  @article{Rosenblum2001,  abstract = {We propose a method for experimental detection of directionality of weak coupling between two self-sustained oscillators from bivariate data. The technique is applicable to both noisy and chaotic systems that can be nonidentical or even structurally different. We introduce an index that quantifies the asymmetry in coupling.},  author = {Rosenblum, M G and Pikovsky, A S},  issn = {1539-3755},  journal = {Physical review. E, Statistical, nonlinear, and soft matter physics},  month = oct,  number = {4 Pt 2},  pages = {045202},  pmid = {11690077},  title = {{Detecting direction of coupling in interacting oscillators.}},  url = {http://www.ncbi.nlm.nih.gov/pubmed/11690077},  volume = {64},  year = {2001}  }