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Yeragani, Vikram Kumar and Rao, Radhakrishna KA (2003) Nonlinear measures of QT interval series: novel indices of cardiac repolarization lability: MEDqthr and LLEqthr. In: Psychiatry Research, 117 (2). pp. 177-190.
Yeragani, VK and Rao, Radhakrishna and Jayaraman, Anusha and Pohl, Robert and Balon, Richard and Glitz, Debra (2002) Heart rate time series: decreased chaos after intravenous lactate and increased non-linearity after isoproterenol in normal subjects. In: Psychiatry Research, 109 (1). pp. 81-92.