Jun-ichi Nishizawa, Tetsuo Sasaki, Ken Suto, Tadao Tanabe, Kyosuke Saito, Tetsuya Yamada, Tomoyuki Kimura “THz transmittance measurements of nucleobases and related molecules in the 0.4- to 5.8-THz region using a GaP THz wave generator” Optics Communications, 246 (2005), 229-239.