I. Sakata, T. Ueda, H. Murakawa, K. Sugimoto, H. Asano, N. Takenaka, R. Yasuda, T. Tomura and M. Shiozawa
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detector 605 ( 1 ): 131 - 133 , 2009