Efficient Synthesis of Azo Dye Labeled Terpenes, Sugars, and Steroids Using N-(4-Arylazobenzoyl)-1H-benzotriazoles - Katritzky, Alan R.; Tala, Srinivasa R.; Abo-Dya, Nader E.; Abdel-Samii, Zakaria K. (Synthesis, 2009)