Halogenia (salt-making substances) for the elements chlorine, iodine, and fluorine. See: Berzelius, Jacob. Årsberättelser om Framstegen i Physik och Chemie
G. Formation of Xenon Difluoride from Xenon and Oxygen Difluoride or Fluorine in Pyrex Glass at Room Temperature. Inorganic Chemistry. 1965, 4 (9): 1370–1371