G. Guerrero - Mora, E. Palacios - Hernández, J. M. Kortelainen, A. M. Bianchi, and M. O. Méndez, “Multichannel Analysis of an Unobtrusive Sensor for Sleep Apnea-Hypopnea Detection”, Rev Mex Ing Biomed, vol. 35, no. 1, pp. 29–40, Jan. 2014.