A preliminary study of indoor radon levels at historical area of Shkodra city M. Kuqali, Gj. Rrota, G. Nafezi, Dh. Kuqi and Denisa Salillari Eur. Phys. J. Spec. Top., Publication ahead of print Published online: 09 June 2025 DOI: 10.1140/epjs/s11734-025-01718-5