Stanek, Miroslav, and Milan Sigmund. “Analysis of Closing-to-Opening Phase Ratio in Top-to-Bottom Glottal Pulse Segmentation for Psychological Stress Detection”. Elektronika ir Elektrotechnika 22, no. 5 (October 3, 2016): 79 - 83. Accessed July 7, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/16348.