Optical Identification of the ASCA Lynx Deep Survey: An Association of QSOs and a Supercluster at z=1.3? - Ohta, K; Akiyama, M; Ueda, Y; Yamada, T; Nakanishi, K; Dalton, G; Ogasaka, Y; Kii, T; Hayashida, K (Astrophys.J., 2003)