Guignard, Jeremie, Dr. Ezra Kwok, and Anthony Chan. 2009. “Relevance Of ECG and Spo2 Frequency Spectra for Patient Respiratory Status Monitoring During Remifentanil-Induced Conscious Sedation for Lithotripsy”. CMBES Proceedings 32 (1). https://proceedings.cmbes.ca/index.php/proceedings/article/view/244.