One-Pot Synthesis of Dinucleoside (3′,5′)-Methylphosphonothioates and their Seleno Congeners via the Phosphonotriazolidite Approach - Wozniak, Lucyna A; Bukowiecka-Matusiak, Malgorzata; Gora, Marcin; Stec, Wojciech J (Synlett, 2006)