Curran, DP and Hadida, S and Kim, SY (1999) tris(2-Perfluorohexylethyl)tin azide: A new reagent for preparation of 5-substituted tetrazoles from nitriles with purification by fluorous/organic liquid-liquid extraction. Tetrahedron, 55 (29). 8997 - 9006. ISSN 0040-4020