V. M. Tan, P. X. Hung, T. V. T. Vinh, N. T. V. Khanh, and V. T. Duy, “Holter-Derived Mean Heart Rate as a Predictor of Short-Term Clinical Risk in Patients Hospitalized With Acute Heart Failure”, Cardiol Res, vol. 17, no. 3, pp. 164–169, Jan. 2026, doi: 10.14740/cr2189.