Khazaei, Ardeshir, and Ebrahim Mehdipour. “N-Methyl-N-P-Toluenesulfonylformamide: A Stable and Convenient N-Formylating Agent”. Asian Journal of Chemistry, vol. 12, no. 1, Mar. 2010, pp. 289-90, https://asianpubs.org/index.php/ajchem/article/view/22922.