Eman Abdullah Aldakheel, Alaa A. K. Ismaeel, Ali M. El-Rifaie, Doaa Sami Khafaga, Essam H. Houssein, Anas Bouaouda, Fatma A. Hashim, Mokhtar Said. "Extraction of PEM fuel cell variables based on modified hippopotamus optimization algorithm." Scientific Reports (2025). https://doi.org/10.1038/s41598-025-14862-8