Morokuma, T., Utsumi, Y., Ohta, K., Yamanaka, M., Kawabata, K. S., Inoue, Y., Tanaka, M., Yoshida, M., Itoh, R., Sasada, M., Tominaga, N., Mori, H., Kawabata, M., Nakaoka, T., Chogi, M., Abe, T., Huang, R., Kawahara, N., Kimura, H., Nagashima, H., Takagi, K., Yamazaki, Y., Liu, W., Ohsawa, R., Sako, S., Murata, K. L., Morihana, K., Gilligan, C. K., Isogai, K., Kimura, M., Wakamatsu, Y., Ohnishi, R., Takayama, M., Honda, S., Matsuoka, Y., Yamashita, T., Nagataki, S., & Tanaka, Y. T. (2021). follow-up observations for IceCube-170922A: Detection of rapid near-infrared variability and intensive monitoring of TXS 0506+056. Publications of the Astronomical Society of Japan, 73, 25–43. http://access.bl.uk/ark:/81055/vdc_100121927068.0x000060