Bijak, Katarzyna. “Estimation, Decoding and Forecasting in HMM and Hybrid HMM ANN Models: A Case of Seismic Events in Poland”. Studia Informatica. System and Information Technology, vol. 7, no. 1-2, Dec. 2006, pp. 7-17, https://czasopisma.uws.edu.pl/studiainformatica/article/view/2846.