S, G. Bacopoulou, F. Chryssanthopoulos, S. Koutelekos, J. Lambrou, G.I. Cokkinos, D., Entropy in Cardiac Autonomic Nervous System of Adolescents with General Learning Disabilities or Dyslexia, Advances in Experimental Medicine and Biology, (1339), 121-129, 2021, Springer-Verlag,