Effective Synthesis of 1,3-Diselenole-2-selone-4,5-diselenolate (dsis) and its Utilization for the Synthesis of Selenocycle-fused Tetraselenafulvalene (TSF) Derivatives - Kodani, Mie; Takimiya, Kazuo; Aso, Yoshio; Otsubo, Tetsuo; Nakayashiki, Takashi; Misaki, Yoji (Synthesis, 2001)