Sánchez Noriega, Kefrén and Aguilera Bonet, Irene and Palacios Clemente, Pablo and Wahnón Benarroch, Perla (2009). First-principles properties of an intermediate band material based on Ti-implanted silicon. In: "24th European Photovoltaic Solar Energy Conference", 21-25 Sept 2009, Hamburgo, Alemania. ISBN 3-936338-25-6. pp. 559-563.