O. Mladenov, M. Blazheva, A. Gerchev, D. Kachakova-Yordanova, R. Kaneva, and M. Dikova, “Early development of the first Bulgarian patient with Steel syndrome”, AMB, vol. 53, no. 2, pp. 49–54, Jun. 2026, doi: 10.2478/AMB-2026-0059.