Ryo Hasegawa, Takashi Kimura, Tadao Tanabe, Katsuhiro Nishihara, Akira Taniyama and Yutaka Oyama “THz absorption spectra of akaganeite (β-FeOOH), lepidcrocite (γ-FeOOH) and bernalite (Fe(OH)3)” Journal of Nanosciences: Current Research 3 (2018) 1000126.