B. Duarte Monedero, I. M. Álvarez Jiménez, J. Sánchez Toledano, and C. Simón de Blas, “The impact of public transport policies on the efficiency of operating companies: a comparison between European countries”, TIBE, vol. 24, no. 3A (66A), pp. 675–699, Jan. 2026, doi: 10.15388/Tibe.2025.24.3A.7.