Koyama, Takashi, et al. “Application of Capnography Waveform Analyses for Evaluation of Recovery Process in a Patient With Heart Failure: A Case Report”. Archives of Clinical and Medical Case Reports, vol. 4, no. 5, Sept. 2020, pp. 779-87, https://fortunejournals.org/ojs/index.php/acmcr/article/view/22383.