Aguado Borja-Fos, M. A. y Echeverri Vélez, M. «Factores predictivos de localización dificultosa del espacio epidural: Faitot V, Ourchane R, Dahmani S, Magheru M, Nebout S, Gomas F, Katz A, Salomon L, Keïta-Meyer H. An observational study of factors leading to difficulty in resident anaesthesiologists identifying the epidural space in obstetric patients. Int J Obstet Anesth 2011, 20:124-127», Revista Electrónica AnestesiaR, 3(8), p. 3. doi: 10.30445/rear.v3i8.463.