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Yeragani, VK and Radhakrishna, RKA and Tancer, M and Uhde, T (2002) Nonlinear measures of respiration: Respiratory irregularity and increased chaos of respiration in patients with panic disorder. In: Neuropsychobiology, 46 (3). pp. 111-120.
Radhakrishna, RKA and Dutt, DN and Yeragani, Vikram Kumar (2000) Nonlinear measures of heart rate time series: influence of posture and controlled breathing. In: Autonomic Neuroscience, 83 (3). pp. 148-158.