Szmajda, Mirosław, Mirosław Chyliński, Jerzy Sacha, and Janusz Mroczka. “Three Methods for Determining the Respiratory Waves from ECG (Part II)”. Metrology and Measurement Systems 31, no. 1 (March 30, 2024): 51–71. Accessed October 15, 2026. https://wydawnictwo.pan.pl/index.php/mms/article/view/5254.