D. S. Avalur, “Human breath detection using a microphone,” M.S. Thesis, Faculty of mathematics and natural science, Univ. of Groningen, Groningen, NL, 2013.
O. Yahya, M. Faezipour, “Automatic detection and classification of acoustic breathing cycles,” Proceedings of 2014 Zone 1 Conference of the American Society for Engineering Education, April 2014.