Detrended fluctuation analysis of non-stationary cardiac beat-to-beat interval of sick infantsRathinaswamy B. Govindan, An N. Massaro, Tareq Al-Shargabi, Nickie Niforatos Andescavage, Taeun Chang, Penny Glass and Adre J. du PlessisEPL, 108 4 (2014) 40005DOI: https://doi.org/10.1209/0295-5075/108/40005