Abou-Ras, D.; Harvey, S.: chapter 15 : Summary and outlook. In: Mowafak Al-Jassim and Nancy Haegel [Ed.] : Advanced Characterization of Thin Film Solar CellsStevenage: The Institution of Engineering and Technology, 2020 (IET Energy Engineering Series). - ISBN 978-1-83953-023-4, p. 427-431