Mild and Efficient Synthesis of Benzoxazoles, Benzothiazoles, Benzimidazoles, and Oxazolo[4,5- b ]pyridines Catalyzed by Bi(III) Salts Under Solvent-Free Conditions. - Iraj Mohammadpoor-Baltork; Ahmad R. Khosropour; Seyedeh F. Hojati (Chemical Monthly / Monatshefte für Chemie, 2007)