1. Bridge ends – embankment structure transition, state of art report, D230.1 committee;ERRI,1999
2. La auscultación y los trabajos de vía en la línea del AVE Madrid – Sevilla: análisis de la experiencia y deducción de nuevos criterios de mantenimiento;Ubalde,2004
3. López Pita A, Teixeira PF, Casas-Esplugas C, Ubalde L. Deterioration in geometric track quality on high speed lines: the experience of the Madrid-Seville high speed line (1992–2002). TRB 85th annual meeting. Washington, DC: TRB; 2006. p. 14.
4. The bump at the end of the railway bridge;Nicks,2009
5. Design and construction of backfills for railway track transition zones;Paixão;Proc IMechE, Part F: J Rail Rapid Trans,2013