Lange, Willy; Livingston, Ralph (March 1950). "Studies of Fluorophosphoric Acids and their Derivatives. XIV. Preparation of Anhydrous Difluorophosphoric Acid". Journal of the American Chemical Society. 72 (3): 1280–1281. Bibcode:1950JAChS..72.1280L. doi:10.1021/ja01159a057.
harvard.edu
ui.adsabs.harvard.edu
Lange, Willy; Livingston, Ralph (March 1950). "Studies of Fluorophosphoric Acids and their Derivatives. XIV. Preparation of Anhydrous Difluorophosphoric Acid". Journal of the American Chemical Society. 72 (3): 1280–1281. Bibcode:1950JAChS..72.1280L. doi:10.1021/ja01159a057.