Doubly-charmed pentaquark states in a mass splitting modelShi-Yuan Li, Yan-Rui Liu, Cheng-Rui Shu and Zong-Guo SiEur. Phys. J. Plus, 140 8 (2025) 783DOI: https://doi.org/10.1140/epjp/s13360-025-06732-z