Sage J, Gough W
Department of Physics & Astronomy, University of Wales, Cardiff, UK.
Med Biol Eng Comput. 1998 Mar;36(2):231-2. doi: 10.1007/BF02510749.
A simple device is described that monitors respiration by sounding an alarm if respiration ceases. It is light and portable and performs well, even in a 60 dB noise environment.