Acquistapace, P., A. P. Candeloro, V. Georgiev, and M. L. Manca. “Mathematical Phase Model of Neural Populations Interaction in Modulation of REM/NREM Sleep”. Mathematical Modelling and Analysis, vol. 21, no. 6, Nov. 2016, pp. 794-10, doi:10.3846/13926292.2016.1247302.