Osma Ruiz, Víctor José and Sáenz Lechón, Nicolás and Gutiérrez Arriola, Juana María and Fraile Muñoz, Rubén and Euler, Harald A. and Neumann, Katrin (2013). What can we learn from voice therapy of the speaking voice for singers's voice?. In: "10th Pan-European Voice Conference, Prague, Czech Republic", 21/08/2013 - 24/08/2013, República Checa. ISBN 978-80-260-4832-9. p. 275.